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JavaScript & HTML DOM Reference Manual

Overview

JavaScript Object

JavaScript Array Object JavaScript Boolean Object JavaScript Date Object JavaScript Math Object JavaScript Number Object JavaScript String Object JavaScript RegExp Object JavaScript Global properties / functions JavaScript Operator

Browser Object

Window Object Navigator Object Screen Object History Object Location Object

DOM Object

HTML DOM Document Object HTML DOM Element object HTML DOM Attribute object HTML DOM Event object

HTML Object

<a> <area> <audio> <base> <blockquote> <body> <button> <canvas> <col> <colgroup> <datalist> <del> <details> <dialog> <embed> <fieldset> <form> <iframe> <frameset > <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> - range <input> - password <input> - radio <input> - reset <input> - search <input> - submit <input> - text <input> - time <input> - url <input> - week <keygen> <link> <label> <legend> <li> <map> <menu> <menuItem> <meta> <meter> <object> <ol> <optgroup> <option> <param> <progress> <q> <script> <select> <source> <style> <table> <td> <th> <tr> <textarea> <title> <time> <track> <video>

HTML DOM specified attribute

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Next: HTML DOM value property

Attribute object

Examples

Check whether the attribute has the value specified:

document.getElementById("demo").attributes[0].specified;

Output:

true

Definition and Usage

If you set the property value in the document, the specified property returns true, if the DTD / Schema default value, it returns false.

Browser Support

All major browsers support specified property

grammar

attribute .specified

technical details

return value:	Boolean, true \| false
DOM version	Core Level 1

Attribute object

Previous: HTML DOM getNamedItem () method

Next: HTML DOM value property