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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>Selection.modify: Extending a word towards the end of a line ended by an inline-block.</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<link rel="author" href="" title="Emilio Cobos Álvarez">
<link rel="author" href="" title="Mozilla">
<div id="block">This is a line<div style="display:inline-block"></div></div>
test(function() {
const selection = getSelection();
const block = document.getElementById("block");
selection.collapse(block.childNodes[0], 0);
assert_equals(selection.toString(), "", "Empty selection at beginning");
for (let i = 0; i < 4; ++i) {
selection.modify("extend", "forward", "word");
assert_equals(selection.toString(), "This is a line", "Should've found the four words");