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LibWeb: Implement document.elementFromPoint()

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This function uses our existing hit testing code to determine the
topmost element at the given coordinates relative to the viewport.
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Tim Ledbetter 2024-02-06 06:02:51 +00:00 • committed by Andreas Kling
parent c732e03ea0
commit 69df94ec5c
5 changed files with 75 additions and 0 deletions
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33
Tests/LibWeb/Text/input/DOM/Element-from-point.html Normal file
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<!DOCTYPE html>
<html id="root-element">
<style>
#large-box {
position: absolute;
top: 10px;
left: 500px;
width: 100px;
height: 100px;
background-color: magenta;
}
#small-box {
position: absolute;
top: 35px;
left: 525px;
width: 50px;
height: 50px;
background-color: yellow;
}
</style>
<script src="../include.js"></script>
<div id="large-box"></div><div id="small-box"></div>
<script>
test(() => {
println(`Negative coordinates return null: ${document.elementFromPoint(-1, -1) === null}`);
println(`Coordinates outside the viewport return null: ${document.elementFromPoint(99999, 99999) === null}`);
printElement(document.elementFromPoint(0, 0));
printElement(document.elementFromPoint(500, 10));
printElement(document.elementFromPoint(550, 60));
});
</script>
</html>