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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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Funny that the subgrid example actually has a screenshot from a browser that doesn't support subgrid: https://github.com/GoogleChrome/web.dev/issues/7453
Well, that does say something about the dominance of Chrome...
Concretely, https://github.com/w3c/csswg-drafts/issues/6026#issuecomment... and https://github.com/w3c/csswg-drafts/issues/5254. My summary: a year and two ago, one guy (OK, an Invited Expert, so he is involved in matters and isn’t just a rando) suggested going back to what the spec used to have about `overflow: scroll` on the root, and adding scrollbar-gutter to the ways of activating that behaviour (which would be fair and reasonable), but no one else has really talked about it at all and there’s no movement—and, perplexingly, it doesn’t look to have actually been a motivating case of scrollbar-gutter.
Also scrollbar-gutter is a decidedly incomplete solution, only accounting for block axis overflow (thus inline axis size, vi, almost always equivalent to vw), and failing to handle edge-to-edge styling with classic scrollbars when scrollbars aren’t required. So you’re trading one broken thing for another only-slightly-less-broken thing. In order to be properly useful in the presence of things like full-width elements with background colours, it needs something more like safe-area-inset so you can draw under the scrollbar.