<!DOCTYPE html>
<title>Test elementFromPoint for list-item</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint">
<link rel="author" title="Koji Ishii" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
ul {
font-size: 10px;
}
ul.inside {
list-style-position: inside;
}
.image {
list-style-image: url(../../images/green-16x16.png);
}
.debug-marker {
position: absolute;
width: 0;
height: 0;
outline: 2px solid red;
}
</style>
<body>
<ul>
<li>Outside 1</li>
<li>Outside 2</li>
<li>Outside 3</li>
<li class="image">Image Outside 1</li>
<li class="image">Image Outside 2</li>
</ul>
<ul class="inside">
<li>Inside 1</li>
<li>Inside 2</li>
<li>Inside 3</li>
<li class="image">Image Inside 1</li>
<li class="image">Image Inside 2</li>
</ul>
<script>
setup({explicit_done:true});
window.onload = function() {
for (let li of document.getElementsByTagName('li')) {
test(() => {
let bounds = li.getBoundingClientRect();
let style = window.getComputedStyle(li);
let y = (bounds.top + bounds.bottom) / 2;
if (style.listStylePosition === 'inside') {
// Inside markers are normal inline boxes.
// It is safe to assume "left + 1" is in the box.
let x = bounds.left + 1;
addDebugMarker(x, y);
let result = document.elementFromPoint(x, y);
assert_equals(result, li);
} else {
// The spec does not define outside marker position.
// This code assumes that the marker is within "left - 40" to "left - 1".
// This is heuristic, but all browsers seem to pass with this method.
let result = null;
for (let x = bounds.left - 40; x < bounds.left; x++) {
result = document.elementFromPoint(x, y);
if (result === li) {
addDebugMarker(x, y);
break;
}
}
assert_equals(result, li);
}
}, `<li>${li.textContent}</li>`);
}
done();
};
// Show a marker for the debugging purposes, in case the heuristic doesn't apply.
function addDebugMarker(x, y) {
let div = document.createElement('div');
div.className = 'debug-marker';
let style = div.style;
style.left = x + 'px';
style.top = y + 'px';
document.body.appendChild(div);
}
</script>
</body>
Codebase Browser
chromium