documentmarker-add-adjacent-text.html

<html>
<script src="../../resources/js-test.js"></script>
<body style="min-height: 5000px"> 
<span id="elt">text</span>

<script>
description('Checks that two adjacent TextMatch markers are not being merged.');

if (window.testRunner)
    testRunner.dumpAsText();

var rangeLeft = document.createRange();
var rangeRight = document.createRange();
var elt = document.getElementById('elt').firstChild;
rangeLeft.setStart(elt, 0);
rangeLeft.setEnd(elt, 2);
rangeRight.setStart(elt, 2);
rangeRight.setEnd(elt, 4);

if (!window.internals) {
    alert('This test requires window.interals to run!');
} else {
    internals.addTextMatchMarker(rangeLeft, 'kActive');
    internals.addTextMatchMarker(rangeRight, 'kActive');

    shouldBe('internals.markerCountForNode(elt, "textmatch")', '2');
}

var successfullyParsed = true;
</script>
</body>
</html>

chromium/third_party/blink/web_tests/fast/dom/documentmarker-add-adjacent-text.html