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<!DOCTYPE html>
<link rel="help" href="https://html.spec.whatwg.org/#lazy-load-root-margin">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#scroller {
width: 100px;
height: 100px;
overflow: scroll;
background-color: gray;
}
#scroller2 {
width: 110px;
height: 110px;
overflow: scroll;
}
#scroller3 {
width: 120px;
height: 120px;
overflow: scroll;
}
#spacer {
width: 130px;
height: 130px;
}
#target {
width: 100px;
height: 100px;
}
</style>
<div id=scroller3>
<div id=scroller2>
<div id="scroller">
<div id="spacer"></div>
<iframe
id="target"
src="resources/subframe.html"
loading="lazy"
onload="iframe_onload();"
></iframe>
</div>
</div>
</div>
<script>
const t = async_test(
"Test that lazy-loaded iframes load when near viewport."
);
function iframe_onload() {
t.done();
}
t.step_timeout(() => {
t.unreached_func(
"Timed out while waiting for iframe to load."
)();
}, 2000);
</script>
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