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

We're OK with adding this to script tags as that usage can be interpreted as adding the ability to add async processing to already blocking scripts, so this is an enhancement.

However, we still have concerns about adding additional blocking to stylesheets, particularly for the purpose of blocking on font loading (and as @cynthia mentioned, CKJ fonts can be large and connections can be slow). In the past webkit blocked for up to 30 seconds on webfont loading and the user experience was horrible. CSS added mechanisms to control rendering with webfonts, adding an additional mechanism to achieve this seems bad. 

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