62 lines
2 KiB
HTML
62 lines
2 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>DocumentFragment.prototype.getElementById</title>
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<link rel="help" href="https://dom.spec.whatwg.org/#dom-nonelementparentnode-getelementbyid">
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<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<template>
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<div id="bar">
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<span id="foo" data-yes></span>
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</div>
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<div id="foo">
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<span id="foo"></span>
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<ul id="bar">
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<li id="foo"></li>
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</ul>
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</div>
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</template>
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<script>
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"use strict";
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test(() => {
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assert_equals(typeof DocumentFragment.prototype.getElementById, "function", "It must exist on the prototype");
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assert_equals(typeof document.createDocumentFragment().getElementById, "function", "It must exist on an instance");
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}, "The method must exist");
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test(() => {
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assert_equals(document.createDocumentFragment().getElementById("foo"), null);
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assert_equals(document.createDocumentFragment().getElementById(""), null);
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}, "It must return null when there are no matches");
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test(() => {
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const frag = document.createDocumentFragment();
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frag.appendChild(document.createElement("div"));
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frag.appendChild(document.createElement("span"));
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frag.childNodes[0].id = "foo";
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frag.childNodes[1].id = "foo";
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assert_equals(frag.getElementById("foo"), frag.childNodes[0]);
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}, "It must return the first element when there are matches");
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test(() => {
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const frag = document.createDocumentFragment();
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frag.appendChild(document.createElement("div"));
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frag.childNodes[0].setAttribute("id", "");
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assert_equals(
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frag.getElementById(""),
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null,
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"Even if there is an element with an empty-string ID attribute, it must not be returned"
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);
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}, "Empty string ID values");
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test(() => {
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const frag = document.querySelector("template").content;
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assert_true(frag.getElementById("foo").hasAttribute("data-yes"));
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}, "It must return the first element when there are matches, using a template");
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</script>
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