Dialog element
Method of easily creating custom dialog boxes to display to the user with modal or non-modal options. Also includes a `::backdrop` pseudo-element for behind the element.
accept attribute for file input
Allows a filter to be defined for what type of files a user may pick with from an `<input type="file">` dialog
beforeunloadevent api: user interaction required for dialog box
htmldialogelement api
htmldialogelement api: `cancel` event
htmldialogelement api: close
htmldialogelement api: `close` event
htmldialogelement api: open
htmldialogelement api: returnvalue
htmldialogelement api: show
htmldialogelement api: showmodal
htmlelement api: `beforetoggle` event: `beforetoggle` event fires at dialog elements
htmlelement api: `toggle` event: `toggle` event fires at dialog elements
window api: `beforeunload` event: dialog displays a generic string, not event handler return value
window api: showmodaldialog
css selector: `::backdrop`: support on `dialog` elements
html element: dialog
html element: dialog: open
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