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sqip
"SQIP" (pronounced \skwɪb\ like the non-magical folk of magical descent) is a SVG-based LQIP technique.
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loading-attribute-polyfill
Fast and lightweight dependency-free vanilla JavaScript polyfill for native lazy loading / the awesome loading='lazy'-attribute.
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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.
Alright, so SQIP generates an SVG from an image, see here and here.
I recommend using a polyfill in addition to this: https://github.com/mfranzke/loading-attribute-polyfill
Cross-browser lazy loading for images is already implemented in QCObjects