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JS Reference Manual

JS Reference Manual (Category Order)
JS Reference Manual (Alphabetical Order)

JavaScript

JS Array
JS Boolean
JS Class
JS Date
JS Error
JS Global
JS JSON
JS Map
JS Math
JS Number
JS Promise
JS RegExp
JS Set
JS String
JS Object
JS Operator
JS Operator Precedence
JS Statement
JS Typed Array

Window

Window Object
Window Console
Window History
Window Location
Window Navigator
Window Screen

HTML DOM

HTML Document
HTML Element
HTML Attribute
HTML Event
HTML Event Object
HTML Collection
HTML NodeList
HTML DOMTokenList
HTML Style

Web API

API Canvas
API Console
API Fetch
API Fullscreen
API Geolocation
API History
API MediaQueryList
API Storage
API Validation
Web API

HTML Object

<a>
<abbr>
<address>
<area>
<article>
<aside>
<audio>
<b>
<base>
<bdo>
<blockquote>
<body>
<br>
<button>
<canvas>
<caption>
<cite>
<code>
<col>
<colgroup>
<datalist>
<dd>
<del>
<details>
<dfn>
<dialog>
<div>
<dl>
<dt>
<em>
<embed>
<fieldset>
<figcaption>
<figure>
<footer>
<form>
<head>
<header>
<h1> - <h6>
<hr>
<html>
<i>
<iframe>
<img>
<ins>
<input> button
<input> checkbox
<input> color
<input> date
<input> datetime
<input> datetime-local
<input> email
<input> file
<input> hidden
<input> image
<input> month
<input> number
<input> password
<input> radio
<input> range
<input> reset
<input> search
<input> submit
<input> text
<input> time
<input> url
<input> week
<kbd>
<label>
<legend>
<li>
<link>
<map>
<mark>
<menu>
<menuitem>
<meta>
<meter>
<nav>
<object>
<ol>
<optgroup>
<option>
<output>
<p>
<param>
<pre>
<progress>
<q>
<s>
<samp>
<script>
<section>
<select>
<small>
<source>
<span>
<strong>
<sub>
<summary>
<sup>
<table>
<tbody>
<td>
<tfoot>
<th>
<thead>
<tr>
<textarea>
<time>
<title>
<track>
<u>
<ul>
<var>
<video>

Other Reference Manuals

CSSStyleDeclaration
JS Type Conversion

Elective Courses

Course Recommendation:

CodeW3C.com Treasure Box

Input Checkbox defaultChecked Attribute

HTML DOM Input Checkbox Object

Definition and Usage

defaultChecked The property returns the default value of the 'checked' attribute.

If the checkbox is selected by default, this property returns true, otherwise return false.

Example

Check if the checkbox is selected by default:

var x = document.getElementById("myCheck").defaultChecked;

Try It Yourself

Syntax

checkboxObject.defaultChecked

Technical Details

Return value:	Boolean value. If the checkbox is selected by default, it returns `true`, otherwise return `false`.

Browser Support

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