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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. Chris Peterson‏ @cpeterso 23 Jul 2018
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      YouTube page load is 5x slower in Firefox and Edge than in Chrome because YouTube's Polymer redesign relies on the deprecated Shadow DOM v0 API only implemented in Chrome. You can restore YouTube's faster pre-Polymer design with this Firefox extension:https://addons.mozilla.org/firefox/addon/youtube-classic …

      95 replies 1,598 retweets 2,601 likes
      Show this thread
    2. Chris Peterson‏ @cpeterso 23 Jul 2018
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      YouTube serves a Shadow DOM polyfill to Firefox and Edge that is, unsurprisingly, slower than Chrome's native implementation. On my laptop, initial page load takes 5 seconds with the polyfill vs 1 without. Subsequent page navigation perf is comparable.

      4 replies 77 retweets 229 likes
      Show this thread
    3. Alex Russell‏ @slightlylate 24 Jul 2018
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      Replying to @cpeterso

      Hey Chris, Happy to discuss in DMs if you're available. Complex situation, large codebase, but team is committed to V1 support.

      1 reply 2 retweets 13 likes
    4. Chris Peterson‏ @cpeterso 24 Jul 2018
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      Replying to @slightlylate

      Thanks, Alex! I've heard back from someone on the Polymer team who shared more details: IIUC, Polymer 2.x and 3.x should be compatible with Firefox's native implementation of Shadow DOM V1 (coming in Firefox 63, fingers crossed), though YouTube is still using Polymer 1.x and V0.

      1 reply 0 retweets 8 likes
    5. Alex Russell‏ @slightlylate 25 Jul 2018
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      Replying to @cpeterso

      That's correct. Note that YT *is* using polyfills, but not Shadow DOM V0; instead it's using Polymer's Shady DOM everywhere at the moment: https://www.polymer-project.org/blog/shadydom 

      2 replies 2 retweets 18 likes
    6. KΞNNΞTH C. ⚡‏ @kennethrohde 25 Jul 2018
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      Replying to @slightlylate @gsnedders @cpeterso

      So even on Chrome right?

      1 reply 0 retweets 0 likes
    7. Alex Russell‏ @slightlylate 25 Jul 2018
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      Replying to @kennethrohde @gsnedders @cpeterso

      Correct. You can see this in DevTools; no Shadow DOM anywhere in sight:pic.twitter.com/znZwyMOpNl

      1 reply 1 retweet 10 likes
    8. Malte Ubl‏Verified account @cramforce 25 Jul 2018
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      Replying to @slightlylate @kennethrohde and

      That means the slowness is likely unrelated to the V0. The custom element polyfill is super fast. We’ve never managed to measure it being slower than native.

      2 replies 1 retweet 12 likes
    9. Patrick Meenan‏ @patmeenan 25 Jul 2018
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      Replying to @cramforce @slightlylate and

      AFAIK, the main perf issue is that it is UA-sniffing for Chrome and using HTML imports (injecting the polyfill for non-Chrome browsers). It's the main blocker for removing imports support: https://bugs.chromium.org/p/chromium/issues/detail?id=766694#c14 …

      1 reply 1 retweet 6 likes
    10. Malte Ubl‏Verified account @cramforce 25 Jul 2018
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      Replying to @patmeenan @slightlylate and

      Yeah, polyfilling HTML imports (RIP) sounds like a likely reason.

      1 reply 0 retweets 4 likes
      Alex Russell‏ @slightlylate 25 Jul 2018
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      Replying to @cramforce @patmeenan and

      I keep waiting for Mozilla to lead design of an alternative after killing them in 2014:https://hacks.mozilla.org/2014/12/mozilla-and-web-components/ …

      10:30 AM - 25 Jul 2018
      • 5 Likes
      • Whoopsie Doodles Rowan Merewood Samir Saeedi Abdón Rodríguez Yoav Weiss
      2 replies 0 retweets 5 likes
        1. New conversation
        2. Malte Ubl‏Verified account @cramforce 25 Jul 2018
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          Replying to @slightlylate @patmeenan and

          I vividly remember our discussion as to whether AMP should use HTML imports as the one time Alex was wrong and Malte was right 😅

          1 reply 0 retweets 10 likes
        3. Alex Russell‏ @slightlylate 25 Jul 2018
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          Replying to @cramforce @patmeenan and

          You were totally, absolutely right.

          1 reply 0 retweets 5 likes
        4. 10 more replies
        1. Ian McKellar‏ @ian 25 Jul 2018
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          Replying to @slightlylate @cramforce and

          They already designed XBL in 1999 so what are you waiting for?

          0 replies 0 retweets 0 likes
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