UserAgent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Steps to reproduce the problem:
1. Create a standard HTML page with <link rel=preload as=worker href=anything.js> in head.
2. Open page in Chrome and open Dev Tools
3. The console will display <link rel=preload> must have a valid `as` value.
4. The attached index.html file may be used to test this.

What is the expected behavior?
Worker scripts should be preloaded with <link rel=preload as=worker href=anything.js>.

What went wrong?
Chrome does not recognize "as=worker" as valid attribute for preload links, even though they are in the spec. See:
1) https://developer.mozilla.org/en-US/docs/Web/HTML/Preloading_content#What_types_of_content_can_be_preloaded
2) https://w3c.github.io/preload/#as-attribute

Worse, I cannot preload my worker scripts at all. Neither as=worker nor as=script will work in preload link for a worker script.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 71.0.3578.98  Channel: stable
OS Version: 6.3
Flash Version: 

This affects my Lighthouse/PageSpeedInsights score, as the false errors reported by Chrome count against the site (they report "errors logged to console" and demerit the score for the site.) Lighthouse complains that the scripts should be preloaded, but they cannot be, as Chrome does not recognize the "as=worker" type nor responds when it is changed (experimentally) to "as=script".
 

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