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49 lines
1.8 KiB
HTML
49 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>Below viewport images with loading='lazy' and changed to
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loading='eager' load and 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 below viewport images with loading='lazy' " +
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"and changed to loading='eager' load and do not block " +
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"the window load event.");
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let has_below_viewport_loaded = false;
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let has_window_loaded = false;
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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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const below_viewport_img_onload = t.step_func_done(function() {
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assert_false(has_below_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 have fired before " +
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"below_viewport loaded.");
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has_below_viewport_loaded = true;
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});
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</script>
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<body>
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<div style="height:10000px;"></div>
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<img id="below_viewport" src="resources/image.png?pipe=trickle(d2)"
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loading="lazy" onload="below_viewport_img_onload();">
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<script>
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assert_false(has_window_loaded,
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"The window.load() event should not fire before " +
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"changing below_viewport to loading='eager'.");
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document.getElementById("below_viewport").loading = 'eager';
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</script>
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</body>
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