mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
z-index overhaul. relative above static; negative z-index
1. when stacking without z-index, positioned > floated > normal flow 2. supports negative z-index 3. new stacking context formed when opacity < 1 (standard) 4. new stacking context formed for position:fixed (no standard yet, done in mobile webkit and chrome 22+)
This commit is contained in:
arrix
parent
0277c34310
commit
16d3bef255
46
src/Parse.js
46
src/Parse.js
@ -314,22 +314,36 @@ _html2canvas.Parse = function (images, options) {
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};
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}
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function setZ(zIndex, parentZ){
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// TODO fix static elements overlapping relative/absolute elements under same stack, if they are defined after them
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var newContext;
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if (!parentZ){
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newContext = h2czContext(0);
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return newContext;
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function setZ(element, stack, parentStack){
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var newContext,
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position = stack.cssPosition,
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zIndex = getCSS(element, 'zIndex'),
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opacity = getCSS(element, 'opacity'), // can't use stack.opacity because it's blended
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isPositioned = position !== 'static',
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isFloated = getCSS(element, 'cssFloat') !== 'none';
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// https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/The_stacking_context
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// When a new stacking context should be created:
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// the root element (HTML),
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// positioned (absolutely or relatively) with a z-index value other than "auto",
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// elements with an opacity value less than 1. (See the specification for opacity),
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// on mobile WebKit and Chrome 22+, position: fixed always creates a new stacking context, even when z-index is "auto" (See this post)
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// z-index only applies to positioned elements.
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// however, firefox may return the value set in CSS even if it's not positioned
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if (!isPositioned) { zIndex = 0 ;}
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stack.zIndex = newContext = h2czContext(zIndex);
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newContext.isPositioned = isPositioned;
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newContext.isFloated = isFloated;
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if (!parentStack || (zIndex !== 'auto' && isPositioned) ||
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(opacity && Number(opacity) < 1)) {
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newContext.ownStacking = true;
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}
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if (zIndex !== "auto"){
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newContext = h2czContext(zIndex);
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parentZ.children.push(newContext);
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return newContext;
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if (parentStack) {
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parentStack.zIndex.children.push(stack);
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}
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return parentZ;
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}
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function renderImage(ctx, element, image, bounds, borders) {
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@ -953,21 +967,21 @@ _html2canvas.Parse = function (images, options) {
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var ctx = h2cRenderContext((!parentStack) ? documentWidth() : bounds.width , (!parentStack) ? documentHeight() : bounds.height),
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stack = {
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el: element, // very useful when debugging
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ctx: ctx,
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zIndex: setZ(getCSS(element, "zIndex"), (parentStack) ? parentStack.zIndex : null),
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opacity: setOpacity(ctx, element, parentStack),
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cssPosition: getCSS(element, "position"),
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borders: getBorderData(element),
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clip: (parentStack && parentStack.clip) ? _html2canvas.Util.Extend( {}, parentStack.clip ) : null
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};
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setZ(element, stack, parentStack);
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// TODO correct overflow for absolute content residing under a static position
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if (options.useOverflow === true && /(hidden|scroll|auto)/.test(getCSS(element, "overflow")) === true && /(BODY)/i.test(element.nodeName) === false){
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stack.clip = (stack.clip) ? clipBounds(stack.clip, bounds) : bounds;
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}
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stack.zIndex.children.push(stack);
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return stack;
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}
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@ -1,38 +1,82 @@
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_html2canvas.Renderer = function(parseQueue, options){
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// http://www.w3.org/TR/CSS21/zindex.html
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function createRenderQueue(parseQueue) {
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var queue = [];
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var queue = [],
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rootContext;
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var sortZ = function(zStack){
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var subStacks = [],
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stackValues = [];
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rootContext = (function buildStackingContext(rootNode) {
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var rootContext = {};
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function insert(context, node, specialParent) {
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var zi = node.zIndex.zindex,
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contextForChildren = context, // the stacking context for children
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isPositioned = node.zIndex.isPositioned,
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isFloated = node.zIndex.isFloated,
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stub = {node: node},
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childrenDest; // where children without z-index should be pushed into
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zStack.children.forEach(function(stackChild) {
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if (stackChild.children && stackChild.children.length > 0){
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subStacks.push(stackChild);
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stackValues.push(stackChild.zindex);
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} else {
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queue.push(stackChild);
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if (zi === 'auto') { zi = 0; }
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zi = Number(zi);
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if (!context[zi]) { context[zi] = []; }
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if (node.zIndex.ownStacking) {
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contextForChildren = stub.context = { 0: [{node:node}]};
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if (isPositioned || isFloated) {
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childrenDest = contextForChildren[0][0].children = [];
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}
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} else if (isPositioned || isFloated) {
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childrenDest = stub.children = [];
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}
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});
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stackValues.sort(function(a, b) {
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return a - b;
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});
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if (zi === 0 && specialParent) {
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specialParent.push(stub);
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} else {
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context[zi].push(stub);
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}
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stackValues.forEach(function(zValue) {
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var index;
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subStacks.some(function(stack, i){
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index = i;
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return (stack.zindex === zValue);
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node.zIndex.children.forEach(function(childNode) {
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insert(contextForChildren, childNode, childrenDest);
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});
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sortZ(subStacks.splice(index, 1)[0]);
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}
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insert(rootContext, rootNode);
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return rootContext;
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})(parseQueue);
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function sortZ(context) {
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Object.keys(context).sort().forEach(function(zi) {
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var nonPositioned = [],
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floated = [],
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positioned = [],
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list = [];
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// positioned after static
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context[zi].forEach(function(v) {
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if (v.node.zIndex.isFloated) {
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floated.push(v);
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} else if (v.node.zIndex.isPositioned) {
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positioned.push(v);
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} else {
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nonPositioned.push(v);
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}
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});
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(function walk(arr) {
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arr.forEach(function(v) {
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list.push(v);
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if (v.children) { walk(v.children); }
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});
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})(nonPositioned.concat(floated, positioned));
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list.forEach(function(v) {
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if (v.context) {
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sortZ(v.context);
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} else {
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queue.push(v.node);
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}
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});
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});
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};
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}
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sortZ(parseQueue.zIndex);
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sortZ(rootContext);
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return queue;
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}
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120
tests/cases/zindex/z-index10.html
Normal file
120
tests/cases/zindex/z-index10.html
Normal file
@ -0,0 +1,120 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html>
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<head>
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<!-- https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/The_stacking_context?redirectlocale=en-US&redirectslug=CSS%2FUnderstanding_z-index%2FThe_stacking_context
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-->
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<title>Understanding CSS z-index: The Stacking Context: Example Source</title>
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<script type="text/javascript" src="../../test.js"></script>
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<style type="text/css">
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* {
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margin: 0;
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}
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html {
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padding: 20px;
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font: 12px/20px Arial, sans-serif;
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}
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div {
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opacity: 0.7;
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position: relative;
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}
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h1 {
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font: inherit;
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font-weight: bold;
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}
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#div1, #div2 {
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border: 1px dashed #696;
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padding: 10px;
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background-color: #cfc;
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}
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#div1 {
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z-index: 5;
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margin-bottom: 190px;
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}
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#div2 {
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z-index: 2;
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}
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#div3 {
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z-index: 4;
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opacity: 1;
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position: absolute;
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top: 40px;
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left: 180px;
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width: 330px;
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border: 1px dashed #900;
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background-color: #fdd;
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padding: 40px 20px 20px;
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}
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#div4, #div5 {
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border: 1px dashed #996;
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background-color: #ffc;
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}
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#div4 {
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z-index: 6;
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margin-bottom: 15px;
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padding: 25px 10px 5px;
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}
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#div5 {
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z-index: 1;
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margin-top: 15px;
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padding: 5px 10px;
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}
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#div6 {
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z-index: 3;
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position: absolute;
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top: 20px;
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left: 180px;
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width: 150px;
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height: 125px;
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border: 1px dashed #009;
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padding-top: 125px;
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background-color: #ddf;
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text-align: center;
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}
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</style>
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</head>
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<body>
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<div id="div1">
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<h1>Division Element #1</h1>
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<code>position: relative;<br/>
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z-index: 5;</code>
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</div>
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<div id="div2">
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<h1>Division Element #2</h1>
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<code>position: relative;<br/>
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z-index: 2;</code>
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</div>
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<div id="div3">
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<div id="div4">
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<h1>Division Element #4</h1>
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<code>position: relative;<br/>
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z-index: 6;</code>
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</div>
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<h1>Division Element #3</h1>
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<code>position: absolute;<br/>
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z-index: 4;</code>
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<div id="div5">
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<h1>Division Element #5</h1>
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<code>position: relative;<br/>
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z-index: 1;</code>
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</div>
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<div id="div6">
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<h1>Division Element #6</h1>
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<code>position: absolute;<br/>
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z-index: 3;</code>
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</div>
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</div>
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</body>
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</html>
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34
tests/cases/zindex/z-index5.html
Normal file
34
tests/cases/zindex/z-index5.html
Normal file
@ -0,0 +1,34 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>z-index tests #5</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<script type="text/javascript" src="../../test.js"></script>
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<style type="text/css">
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div.lev1 {
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width: 250px;
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height: 70px;
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position: relative;
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border: 2px solid #669966;
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background-color: #ccffcc;
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padding-left: 5px;
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}
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div.background {
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position: fixed;
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top: 0;
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bottom: 0;
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width: 250px;
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background-color: #ffdddd;
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}
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</style></head>
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<body>
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<div class="lev1">
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LEVEL #1
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</div>
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<div class="background"></div>
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<div class="lev1">
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<span>LEVEL #1</span>
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</div>
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</body>
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</html>
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33
tests/cases/zindex/z-index6.html
Normal file
33
tests/cases/zindex/z-index6.html
Normal file
@ -0,0 +1,33 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>z-index tests #6</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<script type="text/javascript" src="../../test.js"></script>
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<style type="text/css">
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div {
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width: 250px;
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height: 70px;
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position: relative;
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border: 2px solid #669966;
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background-color: #ccffcc;
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padding-left: 5px;
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}
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div.z0 {
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z-index: 0;
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top:105px;
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left:20px;
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background-color: #ffdddd;
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}
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div.z1 {
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z-index: 1;
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}
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</style></head>
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<body>
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<div class="z0"><span>z-index:0</span></div>
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<div>default z-index</div>
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<div class="z1">z-index:1</div>
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</body>
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</html>
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102
tests/cases/zindex/z-index7.html
Normal file
102
tests/cases/zindex/z-index7.html
Normal file
@ -0,0 +1,102 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<title>Stacking without z-index</title>
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<!-- https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/Stacking_without_z-index?redirectlocale=en-US&redirectslug=CSS%2FUnderstanding_z-index%2FStacking_without_z-index -->
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<script type="text/javascript" src="../../test.js"></script>
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<style type="text/css">
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div {
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font: 12px Arial;
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}
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span.bold { font-weight: bold; }
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#normdiv {
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height: 70px;
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border: 1px dashed #999966;
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background-color: #ffffcc;
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margin: 0px 50px 0px 50px;
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text-align: center;
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}
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#reldiv1 {
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opacity: 0.7;
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height: 100px;
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position: relative;
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top: 30px;
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border: 1px dashed #669966;
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background-color: #ccffcc;
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margin: 0px 50px 0px 50px;
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text-align: center;
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}
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#reldiv2 {
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opacity: 0.7;
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height: 100px;
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position: relative;
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top: 15px;
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left: 20px;
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border: 1px dashed #669966;
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background-color: #ccffcc;
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margin: 0px 50px 0px 50px;
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text-align: center;
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}
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#absdiv1 {
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opacity: 0.7;
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position: absolute;
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width: 150px;
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height: 350px;
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top: 10px;
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left: 10px;
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border: 1px dashed #990000;
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background-color: #ffdddd;
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text-align: center;
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}
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#absdiv2 {
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opacity: 0.7;
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position: absolute;
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width: 150px;
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height: 350px;
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top: 10px;
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right: 10px;
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border: 1px dashed #990000;
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background-color: #ffdddd;
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text-align: center;
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}
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</style></head>
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<body>
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<br /><br />
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<div id="absdiv1">
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<br /><span class="bold">DIV #1</span>
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<br />position: absolute;
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</div>
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<div id="reldiv1">
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<br /><span class="bold">DIV #2</span>
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<br />position: relative;
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</div>
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<div id="reldiv2">
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<br /><span class="bold">DIV #3</span>
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<br />position: relative;
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</div>
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<div id="absdiv2">
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<br /><span class="bold">DIV #4</span>
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<br />position: absolute;
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</div>
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<div id="normdiv">
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<br /><span class="bold">DIV #5</span>
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<br />no positioning
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</div>
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</body></html>
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104
tests/cases/zindex/z-index8.html
Normal file
104
tests/cases/zindex/z-index8.html
Normal file
@ -0,0 +1,104 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<title>Stacking and float</title>
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<!-- https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/Stacking_and_float?redirectlocale=en-US&redirectslug=CSS%2FUnderstanding_z-index%2FStacking_and_float -->
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<script type="text/javascript" src="../../test.js"></script>
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<style type="text/css">
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div {
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font: 12px Arial;
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}
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span.bold { font-weight: bold; }
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|
||||
#absdiv1 {
|
||||
opacity: 0.7;
|
||||
position: absolute;
|
||||
width: 150px;
|
||||
height: 200px;
|
||||
top: 10px;
|
||||
right: 140px;
|
||||
border: 1px dashed #990000;
|
||||
background-color: #ffdddd;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#normdiv {
|
||||
/*opacity: 0.7;*/
|
||||
height: 100px;
|
||||
border: 1px dashed #999966;
|
||||
background-color: #ffffcc;
|
||||
margin: 0px 10px 0px 10px;
|
||||
text-align: left;
|
||||
}
|
||||
|
||||
#flodiv1 {
|
||||
opacity: 0.7;
|
||||
margin: 0px 10px 0px 20px;
|
||||
float: left;
|
||||
width: 150px;
|
||||
height: 200px;
|
||||
border: 1px dashed #009900;
|
||||
background-color: #ccffcc;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#flodiv2 {
|
||||
opacity: 0.7;
|
||||
margin: 0px 20px 0px 10px;
|
||||
float: right;
|
||||
width: 150px;
|
||||
height: 200px;
|
||||
border: 1px dashed #009900;
|
||||
background-color: #ccffcc;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#absdiv2 {
|
||||
opacity: 0.7;
|
||||
position: absolute;
|
||||
width: 150px;
|
||||
height: 100px;
|
||||
top: 130px;
|
||||
left: 100px;
|
||||
border: 1px dashed #990000;
|
||||
background-color: #ffdddd;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
</style></head>
|
||||
|
||||
<body>
|
||||
|
||||
<br /><br />
|
||||
|
||||
<div id="absdiv1">
|
||||
<br /><span class="bold">DIV #1</span>
|
||||
<br />position: absolute;
|
||||
</div>
|
||||
|
||||
<div id="flodiv1">
|
||||
<br /><span class="bold">DIV #2</span>
|
||||
<br />float: left;
|
||||
</div>
|
||||
|
||||
<div id="flodiv2">
|
||||
<br /><span class="bold">DIV #3</span>
|
||||
<br />float: right;
|
||||
</div>
|
||||
|
||||
<br />
|
||||
|
||||
<div id="normdiv">
|
||||
<br /><span class="bold">DIV #4</span>
|
||||
<br />no positioning
|
||||
</div>
|
||||
|
||||
<div id="absdiv2">
|
||||
<br /><span class="bold">DIV #5</span>
|
||||
<br />position: absolute;
|
||||
</div>
|
||||
|
||||
</body></html>
|
||||
108
tests/cases/zindex/z-index9.html
Normal file
108
tests/cases/zindex/z-index9.html
Normal file
@ -0,0 +1,108 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
||||
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||||
<html>
|
||||
<head><title>Adding z-index</title>
|
||||
<!-- https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/Adding_z-index?redirectlocale=en-US&redirectslug=CSS%2FUnderstanding_z-index%2FAdding_z-index -->
|
||||
<script type="text/javascript" src="../../test.js"></script>
|
||||
<style type="text/css">
|
||||
|
||||
div {
|
||||
opacity: 0.7;
|
||||
font: 12px Arial;
|
||||
}
|
||||
|
||||
span.bold { font-weight: bold; }
|
||||
|
||||
#normdiv {
|
||||
z-index: 8;
|
||||
height: 70px;
|
||||
border: 1px dashed #999966;
|
||||
background-color: #ffffcc;
|
||||
margin: 0px 50px 0px 50px;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#reldiv1 {
|
||||
z-index: 3;
|
||||
height: 100px;
|
||||
position: relative;
|
||||
top: 30px;
|
||||
border: 1px dashed #669966;
|
||||
background-color: #ccffcc;
|
||||
margin: 0px 50px 0px 50px;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#reldiv2 {
|
||||
z-index: 2;
|
||||
height: 100px;
|
||||
position: relative;
|
||||
top: 15px;
|
||||
left: 20px;
|
||||
border: 1px dashed #669966;
|
||||
background-color: #ccffcc;
|
||||
margin: 0px 50px 0px 50px;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#absdiv1 {
|
||||
z-index: 5;
|
||||
position: absolute;
|
||||
width: 150px;
|
||||
height: 350px;
|
||||
top: 10px;
|
||||
left: 10px;
|
||||
border: 1px dashed #990000;
|
||||
background-color: #ffdddd;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
#absdiv2 {
|
||||
z-index: 1;
|
||||
position: absolute;
|
||||
width: 150px;
|
||||
height: 350px;
|
||||
top: 10px;
|
||||
right: 10px;
|
||||
border: 1px dashed #990000;
|
||||
background-color: #ffdddd;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
</style></head>
|
||||
|
||||
<body>
|
||||
|
||||
<br /><br />
|
||||
|
||||
<div id="absdiv1">
|
||||
<br /><span class="bold">DIV #1</span>
|
||||
<br />position: absolute;
|
||||
<br />z-index: 5;
|
||||
</div>
|
||||
|
||||
<div id="reldiv1">
|
||||
<br /><span class="bold">DIV #2</span>
|
||||
<br />position: relative;
|
||||
<br />z-index: 3;
|
||||
</div>
|
||||
|
||||
<div id="reldiv2">
|
||||
<br /><span class="bold">DIV #3</span>
|
||||
<br />position: relative;
|
||||
<br />z-index: 2;
|
||||
</div>
|
||||
|
||||
<div id="absdiv2">
|
||||
<br /><span class="bold">DIV #4</span>
|
||||
<br />position: absolute;
|
||||
<br />z-index: 1;
|
||||
</div>
|
||||
|
||||
<div id="normdiv">
|
||||
<br /><span class="bold">DIV #5</span>
|
||||
<br />no positioning
|
||||
<br />z-index: 8;
|
||||
</div>
|
||||
|
||||
</body></html>
|
||||
Loading…
Reference in New Issue
Block a user