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LazyLoad: Add external web platform tests for the "loading" attribute.

This CL includes tests for:
- testing that images and iframes with the attribute loading="lazy" are deferred until they come into view
- testing that images and iframes with the attribute loading="eager" are loaded immediately

Bug: 916260
Change-Id: I323faa31c7683663d0d0136a719cf83c25758ad6
  • Loading branch information
scott-little authored and chromium-wpt-export-bot committed Jun 22, 2019
1 parent cc0f6ff commit 490f60bf5a5dba1b8dc8b0ebdcf25cfb60c610f8
@@ -0,0 +1,62 @@
<!DOCTYPE html>
<head>
<title>Iframes with loading='eager' load immediately regardless of their position with respect to the viewport.</title>
<link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
<link rel="help" href="https://github.com/scott-little/lazyload">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>

<!--
Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
-->

<body>
<iframe id="in_viewport" src="resources/same-origin-subframe.html?second" loading="eager" width="200px" height="100px">
</iframe>
<div style="height:10000px;"></div>

<!--
The below_viewport element loads very slowly in order to ensure that the
window load event is blocked on it.
-->
<iframe id="below_viewport" src="slow-redirect.py?location=resources%2Fsame-origin-subframe.html" loading="eager" width="200px" height="100px">
</iframe>
</body>

<script>
let t = async_test("Test that iframes with loading='eager' load immediately regardless of their position with respect to the viewport.");
let has_in_viewport_element_loaded = false;
let has_in_viewport_subframe_window_loaded = false;
let in_viewport_frame = document.getElementById("in_viewport");
in_viewport_frame.testOnSubframeWindowLoad = function() {
assert_false(has_in_viewport_element_loaded);
assert_false(has_in_viewport_subframe_window_loaded);
has_in_viewport_subframe_window_loaded = true;
};
in_viewport_frame.addEventListener("load", t.step_func(function() {
assert_false(has_in_viewport_element_loaded);
assert_true(has_in_viewport_subframe_window_loaded);
has_in_viewport_element_loaded = true;
}));
let has_below_viewport_element_loaded = false;
let has_below_viewport_subframe_window_loaded = false;
let below_viewport_frame = document.getElementById("below_viewport");
below_viewport_frame.testOnSubframeWindowLoad = function() {
assert_false(has_below_viewport_element_loaded);
assert_false(has_below_viewport_subframe_window_loaded);
has_below_viewport_subframe_window_loaded = true;
};
below_viewport_frame.addEventListener("load", t.step_func(function() {
assert_false(has_below_viewport_element_loaded);
assert_true(has_below_viewport_subframe_window_loaded);
has_below_viewport_element_loaded = true;
}));
window.addEventListener("load", t.step_func_done(function() {
assert_true(has_in_viewport_element_loaded);
assert_true(has_below_viewport_element_loaded);
}));
</script>
@@ -0,0 +1,72 @@
<!DOCTYPE html>
<head>
<title>Iframes with loading='lazy' load when in the viewport</title>
<link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
<link rel="help" href="https://github.com/scott-little/lazyload">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>

<!--
Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
-->

<body>
<iframe id="in_viewport" src="resources/same-origin-subframe.html?first" loading="lazy" width="200px" height="100px">
</iframe>
<div style="height:10000px;"></div>
<iframe id="below_viewport" src="resources/same-origin-subframe.html?second" loading="lazy" width="200px" height="100px">
</iframe>

<!--
This async script loads very slowly in order to ensure that, if the
below_viewport element has started loading, it has a chance to finish
loading before window.load() happens, so that the test will dependably fail
in that case instead of potentially passing depending on how long different
resource fetches take.
-->
<script async src="/common/slow.py"></script>
</body>

<script>
let t = async_test("Test that iframes with loading='lazy' load once they enter the viewport.");
let has_window_loaded = false;
let has_in_viewport_element_loaded = false;
let has_in_viewport_subframe_window_loaded = false;
let in_viewport_frame = document.getElementById("in_viewport");
in_viewport_frame.testOnSubframeWindowLoad = function() {
assert_false(has_window_loaded);
assert_false(has_in_viewport_element_loaded);
assert_false(has_in_viewport_subframe_window_loaded);
has_in_viewport_subframe_window_loaded = true;
};
in_viewport_frame.addEventListener("load", t.step_func(function() {
assert_false(has_window_loaded);
assert_false(has_in_viewport_element_loaded);
assert_true(has_in_viewport_subframe_window_loaded);
has_in_viewport_element_loaded = true;
}));
window.addEventListener("load", t.step_func(function() {
assert_false(has_window_loaded);
assert_true(has_in_viewport_element_loaded);
has_window_loaded = true;
document.getElementById("below_viewport").scrollIntoView();
}));
let has_below_viewport_subframe_window_loaded = false;
let below_viewport_frame = document.getElementById("below_viewport");
below_viewport_frame.testOnSubframeWindowLoad = function() {
assert_true(has_window_loaded);
assert_true(has_in_viewport_element_loaded);
assert_false(has_below_viewport_subframe_window_loaded);
has_below_viewport_subframe_window_loaded = true;
};
below_viewport_frame.addEventListener("load", t.step_func_done(function() {
assert_true(has_window_loaded);
assert_true(has_in_viewport_element_loaded);
assert_true(has_below_viewport_subframe_window_loaded);
}));
</script>
@@ -0,0 +1,44 @@
<!DOCTYPE html>
<head>
<title>Images with loading='eager' load immediately regardless of their position with respect to the viewport</title>
<link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
<link rel="help" href="https://github.com/scott-little/lazyload">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>

<!--
Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
-->

<body>
<img id="in_viewport" src="resources/image.png?second" loading="eager">
<div style="height:10000px;"></div>
<!--
The below_viewport element loads very slowly in order to ensure that the
window load event is blocked on it.
-->
<img id="below_viewport" src="slow-redirect.py?location=resources%2Fimage.png" loading="eager">
</body>

<script>
let t = async_test("Test that images with loading='eager' load immediately regardless of their position with respect to the viewport.");
let has_in_viewport_loaded = false;
document.getElementById("in_viewport").addEventListener("load", t.step_func(function() {
assert_false(has_in_viewport_loaded);
has_in_viewport_loaded = true;
}));
let has_below_viewport_loaded = false;
document.getElementById("below_viewport").addEventListener("load", t.step_func(function() {
assert_false(has_below_viewport_loaded);
has_below_viewport_loaded = true;
}));
window.addEventListener("load", t.step_func_done(function() {
assert_true(has_in_viewport_loaded);
assert_true(has_below_viewport_loaded);
}));
</script>
@@ -0,0 +1,52 @@
<!DOCTYPE html>
<head>
<title>Images with loading='lazy' load when in the viewport</title>
<link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
<link rel="help" href="https://github.com/scott-little/lazyload">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>

<!--
Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
-->

<body>
<img id="in_viewport" src="resources/image.png?first" loading="lazy">
<div style="height:10000px;"></div>
<img id="below_viewport" src="resources/image.png?second" loading="lazy">

<!--
This async script loads very slowly in order to ensure that, if the
below_viewport element has started loading, it has a chance to finish
loading before window.load() happens, so that the test will dependably fail
in that case instead of potentially passing depending on how long different
resource fetches take.
-->
<script async src="/common/slow.py"></script>
</body>

<script>
let t = async_test("Test that images with loading='lazy' load once they enter the viewport.");
let has_in_viewport_loaded = false;
let has_window_loaded = false;
document.getElementById("in_viewport").addEventListener("load", t.step_func(function() {
assert_false(has_in_viewport_loaded);
assert_false(has_window_loaded);
has_in_viewport_loaded = true;
}));
window.addEventListener("load", t.step_func(function() {
assert_true(has_in_viewport_loaded);
assert_false(has_window_loaded);
has_window_loaded = true;
document.getElementById("below_viewport").scrollIntoView();
}));
document.getElementById("below_viewport").addEventListener("load", t.step_func_done(function() {
assert_true(has_in_viewport_loaded);
assert_true(has_window_loaded);
}));
</script>
Binary file not shown.
@@ -0,0 +1,10 @@
<!DOCTYPE html>
<body>
<p>Subframe</p>
</body>

<script>
window.addEventListener("load", function() {
window.frameElement.testOnSubframeWindowLoad();
});
</script>
@@ -0,0 +1,10 @@
import time

def main(request, response):
"""Simple handler that causes redirection after a 2 second wait.
The request query parameter "location" is the resource to redirect to.
"""
time.sleep(2);
response.status = 302
response.headers.set("Location", request.GET.first("location"))

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