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<!DOCTYPE html>
<meta charset="utf-8">
<title>Selection.modify() tests</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div>Test, these are <strong id="strong"> strong </strong> <em id="em"> italic </em> normal.</div>
<pre id="preLinefeed">
foo
bar
</pre>
<pre id="preBr">
foo<br>bar
</pre>
<pre id="preLinefeedBr">
foo
<br>
bar
</pre>
<script>
const selection = getSelection();
test(() => {
selection.collapse(strong.childNodes[0], 4);
selection.modify("extend", "backward", "word")
assert_equals(selection.focusNode, strong.childNodes[0]);
assert_equals(selection.focusOffset, 1);
selection.collapse(em.childNodes[0], 4);
selection.modify("extend", "backward", "word")
assert_equals(selection.focusNode, em.childNodes[0]);
assert_equals(selection.focusOffset, 1);
}, "Stop at previous word boundary when whitespaces are trimmed");
test(() => {
const preLinefeed = document.getElementById("preLinefeed");
const textChild = preLinefeed.childNodes[0];
selection.collapse(textChild, 3);
selection.modify("move", "forward", "character");
assert_equals(selection.focusNode, textChild);
assert_equals(selection.focusOffset, 4);
}, "Jump linefeed forward");
test(() => {
const preLinefeed = document.getElementById("preLinefeed");
const textChild = preLinefeed.childNodes[0];
selection.collapse(textChild, 4);
selection.modify("move", "backward", "character");
assert_equals(selection.focusNode, textChild);
assert_equals(selection.focusOffset, 3);
}, "Jump linefeed backward");
test(() => {
const preBr = document.getElementById("preBr");
const [firstTextChild, br, secondTextChild] = preBr.childNodes;
selection.collapse(firstTextChild, 3);
selection.modify("move", "forward", "character");
assert_equals(selection.focusNode, secondTextChild);
assert_equals(selection.focusOffset, 0);
}, "Jump <br> forward");
test(() => {
const preBr = document.getElementById("preBr");
const [firstTextChild, br, secondTextChild] = preBr.childNodes;
selection.collapse(secondTextChild, 0);
selection.modify("move", "backward", "character");
assert_equals(selection.focusNode, firstTextChild);
assert_equals(selection.focusOffset, 3);
}, "Jump <br> backward");
test(() => {
const preLinefeedBr = document.getElementById("preLinefeedBr");
selection.collapse(preLinefeedBr, 1);
selection.modify("move", "forward", "character");
const secondTextChild = preLinefeedBr.childNodes[2];
assert_equals(selection.focusNode, secondTextChild);
assert_equals(selection.focusOffset, 0);
}, "Jump <br> forward which follows a linefeed");
test(() => {
const preLinefeedBr = document.getElementById("preLinefeedBr");
selection.collapse(preLinefeedBr, 2);
selection.modify("move", "backward", "character");
const textChild = preLinefeedBr.childNodes[0];
assert_equals(selection.focusNode, textChild);
assert_equals(selection.focusOffset, textChild.textContent.length);
}, "Jump <br> backward which follows a linefeed");
</script>
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