Hi @Wojciech Sobiesiak ,
Modern browsers like Microsoft Edge nowadays are following the HTML5 Standard. The 2 new features you are suggesting actually should be modified from the HTML5 side. Here's where you can send feedback to HTML5 side: https://github.com/whatwg/html.
If they add these features based on your suggestion, you can expect the new features coming to Microsoft Edge in the next releases.
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Best Regards,
Shijie Li