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slightlylate's profile
Alex Russell
Alex Russell
Alex Russell
@slightlylate

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Alex Russell

@slightlylate

Chrome Project 🐡 & Web Standards TL; Blink API OWNER Named PWAs w/ @phae; probably making her ☕ DMs open. Tweets my own; press@google.com for official comms.

San Francisco, The Internet
infrequently.org
Joined December 2010

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    1. Adam Bradley‏ @adamdbradley 12 Apr 2019
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      Replying to @justinfagnani @dfabu and

      Yes. That's also largely the same code as ie11 when a component uses shadow dom, but the css needs to be scoped to simulate SD.

      1 reply 0 retweets 0 likes
    2. Justin Fagnani‏ @justinfagnani 12 Apr 2019
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      Replying to @adamdbradley @dfabu and

      Right, but once you rehydrate to real shadow roots, what do you do with the CSS?

      1 reply 0 retweets 0 likes
    3. Adam Bradley‏ @adamdbradley 12 Apr 2019
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      Replying to @justinfagnani @dfabu and

      It no longer applies. Right now we're not removing it in order to reduce runtime, but that's still worth profiling.

      1 reply 0 retweets 0 likes
    4. Justin Fagnani‏ @justinfagnani 12 Apr 2019
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      Replying to @adamdbradley @dfabu and

      Do you swap in the shadow dom targeting CSS?

      1 reply 0 retweets 0 likes
    5. Adam Bradley‏ @adamdbradley 12 Apr 2019
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      Replying to @justinfagnani @dfabu and

      Not sure I'm following, but the same css, which was first scoped css, is able to be converted into SD css and applied the normal SD way (shadowRoot style when constructable isn't supported). But this is all handled by the compiler and generated client-side.

      1 reply 0 retweets 1 like
    6. Justin Fagnani‏ @justinfagnani 12 Apr 2019
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      Replying to @adamdbradley @dfabu and

      I'm asking about the conversion. Presumably <my-element> will have a rule like: :host { display: block; } which needs to be converted to: my-element { display: block; } Do you convert it client-side back to the original?

      2 replies 0 retweets 2 likes
    7. Matthew Phillips‏ @matthewcp 12 Apr 2019
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      Replying to @justinfagnani @adamdbradley and

      Why not inline a shadow-root element in the head, let the HTML parser trigger upgrades. No need to worry about weird css transforms?

      1 reply 0 retweets 3 likes
    8. Matthew Phillips‏ @matthewcp 12 Apr 2019
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      Replying to @matthewcp @justinfagnani and

      Ideal to me is <my-el> <template is=shadow-root> ... </template> light dom here </my-el> This seems super simple to implement. Very small JS in the head to do upgrades.

      1 reply 0 retweets 3 likes
    9. Alex Russell‏ @slightlylate 12 Apr 2019
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      Replying to @matthewcp @justinfagnani and

      And in this syntax, the shadow root element implicitly attaches to the <my-el> instance as an open root at `.shadowRoot`? I'm fine with throwing closed roots on the fire for this case.

      1 reply 0 retweets 4 likes
    10. Matthew Phillips‏ @matthewcp 12 Apr 2019
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      Replying to @slightlylate @justinfagnani and

      Yeah no one really uses closed roots

      1 reply 0 retweets 0 likes
      Alex Russell‏ @slightlylate 12 Apr 2019
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      Replying to @matthewcp @justinfagnani and

      The semantics of the upgrade are interesting. Does the shadow root apply (and get displayed) *before* the element is upgraded?

      5:43 PM - 12 Apr 2019
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      2 replies 0 retweets 1 like
        1. Adam Bradley‏ @adamdbradley 12 Apr 2019
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          Replying to @slightlylate @matthewcp and

          All good ideas and glad we're talking through them. Right now the steps are, 1) document level scoped styles applied to flat html, 2) transform scoped css to shadow css and apply at the same time the shadow root is created, 3) let normal lazy loading kick in after that

          0 replies 0 retweets 1 like
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        1. Matthew Phillips‏ @matthewcp 12 Apr 2019
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          Replying to @slightlylate @justinfagnani and

          Yes, element upgraded in a deferred script like normal (unless critical for some reason). I think this idea suffers from the children problem though, shadow-root could be upgraded before it's closing tag

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