Good afternoon,

I am wondering if public discussion has been had over the concept of 
introducing a "dialog" element into html5.

Normally a modal dialog is created using scripting and CSS to restrict focus 
and activity within the "modal" segment of the DOM and to style the modal 
section of the DOM to appear as though it is a separate region floating above 
the remainder of the document.

A modal element type could indicate to UAs that a segment of the DOM is to be 
treated as active, while the remainder of the DOM is to be inactive.  Focus 
could be automatically set to the first natively focusable element within the 
modal segment of the DOM, or could be explicitly set through scripting.  UAs 
could provide a default style for modals, as they do for other elements, but 
the developer would normally need to adjust the style using CSS for proper 
sizing and positioning.

Thanks,
Everett Zufelt
http://zufelt.ca

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