dialog element - closing when clicking outside

[o-t-w]

It is overwhelmingly common question on Stack Overflow. Its something that is often not implemented well (see The Dangers of Stopping Event Propogation)
This popular blog post documents one far from perfect method of closing the <dialog> by clicking outside.
Could we please get an easy way to do this?

[OmidHekayati]

As it proposed in #860 I also think <dialog> must have a modal bool attribute <dialog modal> for these reasons:

• closing when clicking outside dialog
• style scrim behind the dialog like dark or blur behind modal dialog!
• ...

[siusin]

Thanks @o-t-w and @OmidHekayati .

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