chromium/content/test/data/gpu/webgl_test_page.html

<!--
Test page used for running WebGL 1 and 2 conformance tests.

Actual test pages are loaded into the iframe. This is so that we can guarantee
that our asynchronous test setup is complete before the test starts.
-->
<link rel="icon" href="data:;base64,="><!-- prevent request for favicon -->
<div id="current_test">No test running.</div>
<iframe id="test_iframe" style="width: 1024px; height: 768px; border: 0;"></iframe>
<script>
var currentTestDiv = document.getElementById('current_test');
var testIframe = document.getElementById('test_iframe');
var testIframeLoaded = false;
function runTest(url) {
  currentTestDiv.innerHTML = 'Current test: ' + url;
  testIframeLoaded = false;
  testHarness.reset();
  wrapper.sendTestStarted();
  testIframe.onload = (_) => { testIframeLoaded = true; };
  testIframe.src = url;
}
</script>