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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.
Per the original PR that added this optimization, this will almost always be slower than setting the individual properties. So, it's better to construct the style attribute directly in the template so that Svelte can optimize it.
Exclusive to elements: Like most Svelte directives (with the exception of on:), this does not work on components. There is an open RFC to allow forwarding directives to components, which would include style directives. However, this RFC has not been accepted at time of writing.