Element 'button' is not supported (for information on implementing this, see the support forums

[Krishna-najpk]

Hi,

I am getting this error while adding button tag in html code. - "Element 'button' is not supported (for information on implementing this, see the support forums"

I want to add button tag like this.
<button type="button" onclick="alert('Hello world!')">Click Me!</button>

Here is my config.

'HTML_Allowed' => 'div,b,strong,i,em,a[href|title],ul,ol,li,p[style],br,span[style],img[width|height|alt|src],iframe[src|width|height|class|frameborder],blockquote, *[style|class],button[type]',
'CSS_AllowedProperties' => 'font,
font-size,
font-weight,
font-style,
font-family,
text-decoration,
padding-left,
color,
background-color,
text-align
',
'URI_SafeIframeRegexp' => '%^(https?:)?//(www.linkedin.com/embed/|www.youtube.com/embed/|player.vimeo.com/video/)%'

[ezyang]

check out http://htmlpurifier.org/docs/enduser-customize.html