A simple example if you are interested in how it works on Chrome.

http://codepen.io/astleychen/pen/Obqzrr 
<http://codepen.io/astleychen/pen/Obqzrr>


—--
Best Regards,
Astley Chen | Mozilla Taiwan


On 21 Dec 2016, at 8:21 AM, Xidorn Quan <[email protected]> wrote:

On Wed, Dec 21, 2016, at 11:12 AM, Mats Palmgren wrote:
> Hi Tim, can you describe how the modality of dialog.showModal() works?
> Does a web page have the power to block the user from interacting
> with the entire browser (all windows)? Or is it just one window?
> or just one tab? or something else?

It just blocks the same document it is in (not even the tab if the
document is in iframe). A modal <dialog> is just another normal HTML
element with some special rendering (and focusing) rules.

- Xidorn
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