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<!doctype html>
<meta charset="utf-8">
<title>getCaretPositionFromPoint should return the correct offset even in iframes with transformation</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view-1/#dom-document-caretpositionfrompoint">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1546612">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#actual {
transform: translateX(100px);
}
</style>
<iframe id="expected"></iframe>
<br>
<iframe id="actual"></iframe>
<script>
const expectedFrame = document.getElementById("expected");
const actualFrame = document.getElementById("actual");
const getCaretPositionOffset = frame => {
const source = `<!doctype html><meta charset="utf-8"><h1>title</h1><p>paragraph</p>`
const elementCenter = elem => {
const rect = elem.getBoundingClientRect();
return [rect.x + rect.width / 2, rect.y + rect.height / 2];
};
return new Promise((resolve, reject) => {
frame.srcdoc = source;
frame.onload = () => {
try {
const frameDoc = frame.contentDocument;
const {offset} = frameDoc.caretPositionFromPoint(
...elementCenter(frameDoc.querySelector("h1"))
);
resolve(offset);
} catch (error) {
reject(error);
}
};
});
};
promise_test(async () => {
assert_equals(...await Promise.all([
getCaretPositionOffset(expectedFrame),
getCaretPositionOffset(actualFrame)
]), "caret offset");
}, "iframe's with equal content should report the same caret offset");
</script>
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