Re: [w3ctag/design-reviews] Design Review: Speculation Rules (Prefetch) (Issue #721)

Hi there,
  
We looked at this again in a breakout today. 
  
The general consensus was that we agree that the functionality is useful, but we have some architectural concerns about the syntax this is introducing in the Web Platform, especially since its is introducing a novel precedent that could affect the direction of even more future Web Platform features.
  
  One thing that came up in the discussion was that this is syntax that is annotating other HTML elements en masse, and the only precedent in the Web Platform for doing so is CSS. Since it could be argued that this is presentational, we were wondering if you have explored extending CSS for this.
  
  Most of your criteria syntax is CSS selectors anyway, and while Selectors do not include matching for URL patterns, this would be more broadly useful anyway, and would make a good addition to selectors anyway. Since CSS is inherently reactive, this would also naturally afford dynamic scoring for links.  
  
  It seems that something like this could reduce the API surface of this feature to a couple of CSS properties, making it simpler to implement and test.
  
  Sorry this has been taking so long.  We're trying to make a concerted effort to come back with actionable feedback so we can close this issue as the consensus is generally positive. We look forward to hearing more as the origin trials progress. If you have other specific issues you would like to ask for TAG's feedback on please let us know.

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