Set display inline for font metrics test img

src/render/font-metrics.ts

@@ -38,6 +38,7 @@ export class FontMetrics {
         img.style.margin = '0';
         img.style.padding = '0';
         img.style.verticalAlign = 'baseline';
+        img.style.display = 'inline';
 
         span.style.fontFamily = fontFamily;
         span.style.fontSize = fontSize;

tests/reftests/text/text.html

@@ -14,6 +14,10 @@
             line-height: 1vw;
         }
 
+        img {
+            display: block;
+        }
+
         .medium {
             font-size: 18px;
             line-height: 2vw;