Re: [w3ctag/design-reviews] Review request on `blocking=render` attribute for scripts, stylesheets and link resources (Issue #727)

Regarding the concern:

1. Since there are scenarios where this feature seems necessary, but also other scenarios where misusing the feature leads to a bad performance, we recommend web authors to use it with caution and only when necessary. It's also no more (or less) of a rendering footgun than putting a script or stylesheet in the head. If that resource has a problem then you have a SPOF but it's not particularly extraordinary in the risk.

2. The risk of `blocking=render` might also be smaller than traditional scripts and stylesheets. Web authors can, e.g., set a timeout that removes the attribute, to manually unblock rendering if it takes too long to load. This is not achievable for traditional scripts and stylesheets.



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