23298 2013-09-19 20:57:40 +0000 dialog::backdrop should be visible by default 2013-09-30 18:47:34 +0000 1 1 1 Unclassified WHATWG HTML unspecified PC All RESOLVED FIXED P2 normal Unsorted 23401 1 falken ian ian mike zcorpan contributor oldest_to_newest 93582 0 falken 2013-09-19 20:57:40 +0000 The suggested UA style sheet[1] has: dialog::backdrop { background: rgba(0,0,0,0.1); } So by default, the backdrop has height and width 0. I suspect most use cases of a modal dialog want a visible backdrop. Those authors will have to add something like: dialog::backdrop { position: fixed; top: 0; bottom: 0; left: 0; right: 0; } which is a bit cumbersome. How about adding such style to the suggested style sheet? [1] http://www.whatwg.org/specs/web-apps/current-work/multipage/rendering.html#flow-content-1 93674 1 ian 2013-09-23 19:44:10 +0000 That's taken care of in: http://fullscreen.spec.whatwg.org/#user-agent-level-style-sheet-defaults 93711 2 zcorpan 2013-09-24 07:53:57 +0000 That sets styles for :fullscreen elements, which dialog generally isn't. 93752 3 ian 2013-09-24 22:19:34 +0000 Ah, right. My bad. 93753 4 contributor 2013-09-24 22:20:39 +0000 Checked in as WHATWG revision r8197. Check-in comment: dialog::backdrop needs positioning, it isn't _that_ magical http://html5.org/tools/web-apps-tracker?from=8196&to=8197