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44 lines
1.5 KiB
HTML
44 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>In viewport images with loading='lazy' and changed to loading='eager'
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do not block the window load event</title>
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<link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">
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<link rel="help" href="https://github.com/scott-little/lazyload">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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</head>
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<!--
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Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
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-->
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<script>
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const t = async_test("Test that in viewport images with loading='lazy' and " +
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"changed to loading='eager' do not block the window " +
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"load event.");
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let has_in_viewport_loaded = false;
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let has_window_loaded = false;
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const in_viewport_img_onload = t.step_func_done(function() {
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assert_false(has_in_viewport_loaded,
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"The in_viewport element should load only once.");
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assert_true(has_window_loaded,
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"The window.load() event should fire before in_viewport image loads.");
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has_in_viewport_loaded = true;
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});
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window.addEventListener("load", t.step_func(function() {
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assert_false(has_window_loaded,
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"The window.load() event should only fire once.");
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has_window_loaded = true;
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}));
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</script>
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<body>
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<img id="in_viewport" src="resources/image.png?pipe=trickle(d2)"
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loading="lazy" onload="in_viewport_img_onload();">
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<script>
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document.getElementById("in_viewport").loading = 'eager';
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</script>
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</body>
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