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HTML attribute "required" is invalid in Windows Internet Explorer 10 Compatibility View

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When running Windows Internet Explorer 10 in Compatibility View, getAttribute may return null. For example, consider the following sample HTML:

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7">
<title>Test Page</title>
<input type="checkbox" id="check" required="no">
<script language="javascript">

if (document.getElementById('check').getAttribute('required') !='no')
alert('Value of required invalid, expecting "no" got "' + document.getElementById('check').getAttribute('required') + '"');
alert('Required is OK');

In this example, the use of the custom HTML attribute with the name "required" in an INPUT tag results in the following error:
Value of required invalid, expecting "no" got "null".

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More Information

Microsoft is currently investigating this issue and will provide updates as more information becomes available. NOTE: This problem does not occur in earlier version of Windows Internet Explorer.

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Keywords: kb

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Article Info
Article ID : 2811765
Revision : 1
Created on : 1/7/2017
Published on : 2/11/2013
Exists online : False
Views : 227