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<!DOCTYPE HTML>
<title>textarea element value/defaultValue/textContent functionality</title>
<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-textarea-value">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
"use strict";
test(() => {
const textarea = document.createElement("textarea");
assert_equals(textarea.defaultValue, "", "defaultValue is empty string when it has no content");
assert_equals(textarea.value, "", "value is empty string when it has no content");
}, "defaultValue and value are the empty string by default");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "foo bar";
assert_equals(textarea.defaultValue, "foo bar", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo bar",
"changing the textContent should change the raw value, and subsequently the api value");
}, "defaultValue and value are affected by setting textContent");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "some text";
textarea.firstChild.nodeValue = "foo bar";
assert_equals(textarea.defaultValue, "foo bar", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo bar",
"changing the textContent should change the raw value, and subsequently the api value");
}, "defaultValue and value are affected by setting nodeValue on a child text node");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "some text";
textarea.firstChild.data = "foo bar";
assert_equals(textarea.defaultValue, "foo bar", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo bar",
"changing the textContent should change the raw value, and subsequently the api value");
}, "defaultValue and value are affected by setting data on a child text node");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "foo bar";
textarea.appendChild(document.createTextNode(" baz"));
assert_equals(textarea.defaultValue, "foo bar baz", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo bar baz",
"changing the textContent should change the raw value, and subsequently the api value");
}, "defaultValue and value are affected by textContent in combination with appending a text node");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "foo bar";
const frag = document.createDocumentFragment();
frag.appendChild(document.createTextNode(" baz"));
const el = document.createElement("span");
el.appendChild(document.createTextNode("qux?"));
frag.appendChild(el);
frag.appendChild(document.createTextNode(" fizz"));
textarea.appendChild(frag);
textarea.appendChild(document.createTextNode(" whee"));
assert_equals(textarea.defaultValue, "foo bar baz fizz whee", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo bar baz fizz whee",
"changing the textContent should change the raw value, and subsequently the api value");
}, "defaultValue and value are affected by textContent in combination with appending a DocumentFragment");
test(() => {
const textarea = document.createElement("textarea");
textarea.appendChild(document.createTextNode("foo bar"));
const child = document.createElement("span");
child.textContent = "baz";
textarea.appendChild(child);
assert_equals(textarea.textContent, "foo barbaz", "the textContent should have *all* the text content");
assert_equals(textarea.defaultValue, "foo bar", "the defaultValue should reflect the child text content");
assert_equals(textarea.value, "foo bar",
"changing the child text content should change the raw value, and subsequently the api value");
}, "defaultValue and value reflect child text content, not textContent");
test(() => {
const textarea = document.createElement("textarea");
textarea.appendChild(document.createTextNode("foo bar"));
const child = document.createElement("span");
child.textContent = "baz";
textarea.appendChild(child);
textarea.defaultValue = "foo";
assert_equals(textarea.childNodes.length, 1, "Only one child node should exist");
assert_equals(textarea.defaultValue, "foo", "the defaultValue should be the new text");
assert_equals(textarea.value, "foo", "the api value should be the new text");
assert_equals(textarea.textContent, "foo", "the textContent should be the new text");
}, "Setting defaultValue wipes out any children, including elements (just like setting textContent)");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "foo\r\nbar\rbaz\nqux";
assert_equals(textarea.defaultValue, "foo\r\nbar\rbaz\nqux", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo\nbar\nbaz\nqux", "The value property should normalize CRLF and CR to LF");
}, "defaultValue and value treat CRLF differently");
test(() => {
const textarea = document.createElement("textarea");
textarea.appendChild(document.createTextNode("foo\r"));
textarea.appendChild(document.createTextNode("\nbar\rbaz\nqux"));
assert_equals(textarea.defaultValue, "foo\r\nbar\rbaz\nqux", "the defaultValue should reflect the textContent");
assert_equals(textarea.value, "foo\nbar\nbaz\nqux", "The value property should normalize CRLF and CR to LF");
}, "value normalizes CRLF even spread over multiple text nodes");
test(() => {
const textarea = document.createElement("textarea");
textarea.textContent = "foo";
textarea.value = "baz";
assert_equals(textarea.defaultValue, "foo", "setting the value property should not affect the defaultValue");
assert_equals(textarea.textContent, "foo", "setting the value property should not affect the textContent");
assert_equals(textarea.value, "baz",
"on setting, the value property must set the element's raw & api value to the new value");
textarea.value = "foo\r\nbar\rbaz\nqux";
assert_equals(textarea.value, "foo\nbar\nbaz\nqux", "The API value should normalize CRLF and CR to LF");
textarea.value = null;
assert_equals(textarea.value, "", "setting the value property to null should result in an empty string");
}, "tests for the value setter");
test(() => {
const textarea = document.createElement("textarea");
textarea.defaultValue = "foo\0";
assert_equals(textarea.defaultValue, "foo\0", "defaultValue after setting defaultValue");
assert_equals(textarea.textContent, "foo\0", "textContent after setting defaultValue");
assert_equals(textarea.value, "foo\0", "value after setting defaultValue");
textarea.textContent = "bar\0";
assert_equals(textarea.defaultValue, "bar\0", "defaultValue after setting textContent");
assert_equals(textarea.textContent, "bar\0", "textContent after setting textContent");
assert_equals(textarea.value, "bar\0", "value after setting textContent");
textarea.value = "baz\0";
assert_equals(textarea.defaultValue, "bar\0", "defaultValue after setting value");
assert_equals(textarea.textContent, "bar\0", "textContent after setting value");
assert_equals(textarea.value, "baz\0", "value after setting value");
}, "tests for U+0000 NULL");
</script>
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