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55 lines
2.2 KiB
HTML
55 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>In-viewport loading=lazy images 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="author" title="Dom Farolino" href="mailto:dom@chromium.org">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="common.js"></script>
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</head>
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<body>
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<!-- This image blocks the window load event for 1 second -->
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<img src="resources/image.png?window-load-blocking&pipe=trickle(d1)">
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<!-- These images must load because they intersect the viewport, but they must
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not block the window load event, because they are loading=lazy -->
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<img id="visible"
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src="resources/image.png?visible&pipe=trickle(d3)" loading="lazy"
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onload="visible_img.resolve();" onerror="visible_img.reject();">
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<img id="visibility_hidden" style="visibility:hidden;"
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src="resources/image.png?visibility_hidden&pipe=trickle(d3)" loading="lazy"
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onload="visibility_hidden_img.resolve();" onerror="visibility_hidden_img.reject();">
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</body>
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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 visible_img = new ElementLoadPromise("visible");
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const visibility_hidden_img = new ElementLoadPromise("visibility_hidden");
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async_test(t => {
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let has_window_loaded = false;
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window.addEventListener("load", t.step_func(() => {
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has_window_loaded = true;
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}));
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Promise.all([visible_img.promise, visibility_hidden_img.promise])
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.then(t.step_func_done(() => {
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assert_true(has_window_loaded,
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"The window load event should fire before the " +
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"in-viewport loading=lazy images load");
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assert_true(visible_img.element().complete,
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"The in-viewport loading=lazy visible image is complete");
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assert_true(visibility_hidden_img.element().complete,
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"The in-viewport loading=lazy visibility:hidden image is " +
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"complete");
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}))
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.catch(t.unreached_func("The images should load successfully"));
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}, "In-viewport loading=lazy images do not block the window load event");
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</script>
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