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<!DOCTYPE html>
<meta charset="utf-8">
<title>Range.getClientRects should correct indexing into trailing surrogates</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view-1/#dom-range-getclientrects">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="surrogates">🌠a🌠</div>
<span id="surrogate">🌠a</span><span id="surrogate2">🌠</span>
<script>
test(function () {
const surrogates = document.getElementById("surrogates");
const surrogate = document.getElementById("surrogate");
const surrogate2 = document.getElementById("surrogate2");
// test range with one container
fullrange = document.createRange();
fullrange.setStart(surrogates.firstChild, 0);
fullrange.setEnd(surrogates.firstChild, 5);
range = document.createRange();
range.setStart(surrogates.firstChild, 1);
range.setEnd(surrogates.firstChild, 5);
assert_equals(range.getClientRects()[0].width, fullrange.getClientRects()[0].width);
range.setStart(surrogates.firstChild, 0);
range.setEnd(surrogates.firstChild, 4);
assert_equals(range.getClientRects()[0].width, fullrange.getClientRects()[0].width);
range.setStart(surrogates.firstChild, 1);
range.setEnd(surrogates.firstChild, 4);
assert_equals(range.getClientRects()[0].width, fullrange.getClientRects()[0].width);
// test range with two containers
fullrange.setStart(surrogate.firstChild, 0);
fullrange.setEnd(surrogate2.firstChild, 2);
range.setStart(surrogate.firstChild, 1);
range.setEnd(surrogate2.firstChild, 2);
assert_equals(range.getClientRects()[0].width, fullrange.getClientRects()[0].width);
assert_equals(range.getClientRects()[1].width, fullrange.getClientRects()[1].width);
range.setStart(surrogate.firstChild, 0);
range.setEnd(surrogate2.firstChild, 1);
assert_equals(range.getClientRects()[0].width, fullrange.getClientRects()[0].width);
assert_equals(range.getClientRects()[1].width, fullrange.getClientRects()[1].width);
range.setStart(surrogate.firstChild, 1);
range.setEnd(surrogate2.firstChild, 1);
assert_equals(range.getClientRects()[0].width, fullrange.getClientRects()[0].width);
assert_equals(range.getClientRects()[1].width, fullrange.getClientRects()[1].width);
}, "Range.getClientRects should correct indexing into trailing surrogates")
</script>
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