1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/element-timing/image-data-uri.html b/testing/web-platform/tests/element-timing/image-data-uri.html
new file mode 100644
index 0000000000..02d88fb244
--- /dev/null
+++ b/testing/web-platform/tests/element-timing/image-data-uri.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe inline image</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+#inline_wee {
+  display: block;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  let beforeRender = performance.now();
+  async_test(function (t) {
+    assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        // Only the first characters of the data URI are included in the entry.
+        const uriPrefix = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKAQMAAAC3/F3+AAAABGdBTUEAALGPC/xhBQAAACBjSFJNAA';
+        checkElementWithoutResourceTiming(entry, uriPrefix, 'my_img', 'inline_wee',
+            beforeRender, document.getElementById('inline_wee'));
+        // The image is a red square of length 10.
+        checkRect(entry, [0, 10, 0, 10]);
+        checkNaturalSize(entry, 10, 10);
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+  }, 'Inline image is observable via Element Timing.');
+</script>
+<img elementtiming='my_img' id='inline_wee' src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKAQMAAAC3/F3+AAAABGdBTUEAALGPC/xhBQAAACBjSFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAABlBMVEX/AAD///9BHTQRAAAAAWJLR0QB/wIt3gAAAAtJREFUCNdjYMAHAAAeAAFuhUcyAAAAJXRFWHRkYXRlOmNyZWF0ZQAyMDE5LTA0LTA1VDIwOjA4OjQxKzAyOjAwPa6EZwAAACV0RVh0ZGF0ZTptb2RpZnkAMjAxOS0wNC0wNVQyMDowODo0MSswMjowMEzzPNsAAAAASUVORK5CYII="/>
+</body>