Developer tools console Error# HTML1524 is incorrect - by IECustomizer

Status : 


ID 806847 Comments
Status Active Workarounds
Type Bug Repros 3
Opened 10/28/2013 10:49:21 PM
Access Restriction Public


Navigate to
and then display the developer tool console.... refresh the page to show suppressed console messages and errors.

the console of Developer tools shows:
HTML1524: Invalid HTML5 DOCTYPE. Consider using the interoperable form "<!DOCTYPE html>".
File: iframe-contentdocument.aspx, Line: 1, Column: 1

while the documentation at


"Invalid DOCTYPE. The shortest valid doctype is "<!DOCTYPE html>"."

Both are incorrect in this case as the DTD is valid

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Posted by ihopethisdisplaynameisnotinuse on 3/7/2014 at 8:29 PM
Reproduced on IE11/Vista. Removing the linebreak from the <!DOCTYPE> prevented a similar error appearing on my site.
Posted by Microsoft on 11/7/2013 at 12:26 PM
Thank you for your feedback. We will be investigating this issue further.
We'll keep you informed of the progress of this bug.
Best regards,

The Internet Explorer Team