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diff --git a/testing/web-platform/tests/element-timing/observe-text.html b/testing/web-platform/tests/element-timing/observe-text.html
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+++ b/testing/web-platform/tests/element-timing/observe-text.html
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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe text</title>
+<body>
+<style>
+body {
+ margin: 20px;
+}
+p {
+ font-size: 12px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+ async_test((t) => {
+ assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
+ let paragraph;
+ let beforeRender;
+ const observer = new PerformanceObserver(
+ t.step_func_done((entryList) => {
+ assert_equals(entryList.getEntries().length, 1);
+ const entry = entryList.getEntries()[0];
+ checkTextElement(entry, 'my_text', 'text_id', beforeRender, paragraph);
+ assert_equals(entry.intersectionRect.left, 20, 'left should be 20.');
+ // Text box size will vary from device to device, so try lower bounding height by 12, width by 100.
+ assert_greater_than_equal(entry.intersectionRect.right, 120);
+
+ assert_equals(entry.intersectionRect.top, 20, 'top should be 20.');
+ assert_greater_than_equal(entry.intersectionRect.bottom, 32);
+ })
+ );
+ observer.observe({entryTypes: ['element']});
+ // We add the iframe during onload to be sure that the observer is registered
+ // in time for it to observe the element timing.
+ window.onload = () => {
+ paragraph = document.createElement('p');
+ paragraph.innerHTML = 'This is text I care about';
+ paragraph.setAttribute('elementtiming', 'my_text');
+ paragraph.setAttribute('id', 'text_id');
+ document.body.appendChild(paragraph);
+ beforeRender = performance.now();
+ };
+ }, 'Paragraph with elementtiming attribute is observed.');
+</script>
+
+</body>