32388 2009-12-10 11:54:17 -0800 Remove or rename overlay overflow values 2024-09-24 16:09:11 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) All All RESOLVED WONTFIX P2 Normal --- 1 arv webkit-unassigned bfulgham hyatt jchaffraix simon.fraser syoichi tabatkins tony waleedsattar5 xfq.free zalan oldest_to_newest 170482 0 arv 2009-12-10 11:54:17 -0800 WebKit currently has a proprietary CSS overflow value called "overlay" which is undocumented and as far as I can tell from reading the code works exactly like "auto". We should either remove it or rename it to "-webkit-overlay". 813166 1 tony 2013-01-22 10:41:41 -0800 Looks like hyatt tried to rename to -webkit-overlay in 2006: http://trac.webkit.org/changeset/14968 . We should histogram and try again. 815584 2 tony 2013-01-24 10:25:36 -0800 10:05 < tony^work> dhyatt: What was overflow: overlay? 10:06 < tony^work> dhyatt: It looks like it's the same as overflow: auto now. 10:06 < dhyatt> a way for scrollbars to overlay the content instead of taking up space 10:06 < dhyatt> now all scrollbars on OS X overlay content 10:06 < dhyatt> so on OS X at least it's not that relevant 10:06 < dhyatt> still applies to say Windows though Looks like it used in a few places on the web (also in the WebKit Web Inspector). Ojan says we should probably to try standardize it. 815601 3 jchaffraix 2013-01-24 10:43:20 -0800 > Looks like it used in a few places on the web (also in the WebKit Web Inspector). Ojan says we should probably to try standardize it. I am pretty sure I asked about removing it at some point last year, the answer was that it was used internally by Apple (I can't recall the exact wording and lost my logs of this conversation). It may also make sense for mobile as overflow: overlay scrollbars don't trigger a layout. 815624 4 tabatkins 2013-01-24 11:02:41 -0800 Okay, so it's identical to "auto" in behavior, but just forces the scrollbars (if created) to be overlay rather than space-filling? This sounds like an okay kind of thing to standardize, and I can try to do so if my above description is correct. 815662 5 tony 2013-01-24 11:32:20 -0800 (In reply to comment #4) > Okay, so it's identical to "auto" in behavior, but just forces the scrollbars (if created) to be overlay rather than space-filling? Yes, that's right. Here's an example: http://jsfiddle.net/rNxgD/ . 1151290 6 simon.fraser 2015-12-24 12:57:30 -0800 I wonder if we can try to make it -webkit again, or remove it. 1160653 7 webkit 2016-01-31 05:40:13 -0800 There's talk of standardizing some variation of this: https://github.com/w3c/csswg-drafts/issues/92 1383467 8 xfq.free 2017-12-19 18:18:09 -0800 CSSWG standardized this behavior by add a scrollbar-gutter property: * https://drafts.csswg.org/css-overflow-4/#scollbar-gutter-property * https://github.com/w3c/csswg-drafts/issues/92#issuecomment-272567887 1461631 9 simon.fraser 2018-09-20 17:56:47 -0700 I'm making 'overlay' a synonym for 'auto': bug 189811. I'd prefer to remove it, but that causes sites that use it to fall back to overflow:auto, which would be a breaking behavior change. 1882474 10 bfulgham 2022-07-12 12:46:46 -0700 We can revisit removing 'overlay' entirely once the web has moved on.