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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. Alex Russell‏ @slightlylate 28 Oct 2019
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      Replying to @slightlylate @kosamari @yamaha_bike

      I think it's font related, mostly about fallbacks. Wonder if it's faster on a JP locale device 🤔

      1 reply 0 retweets 1 like
    2. Alex Russell‏ @slightlylate 28 Oct 2019
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      Replying to @slightlylate @kosamari @yamaha_bike

      Here's the tracefile from a Nokia 2:https://www.dropbox.com/s/0jfnylpbe1mng29/trace_Nokia_2_yamaha_lightweight_site.json.gz?dl=0 …

      1 reply 0 retweets 0 likes
    3. Alex Russell‏ @slightlylate 28 Oct 2019
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      Replying to @slightlylate @kosamari @yamaha_bike

      The little green tasks within this layotu are those `FontCache::FallbackFontForCharacter` tasks, which I assume do some sort of I/O:pic.twitter.com/GwuNYdqjX9

      1 reply 0 retweets 0 likes
    4. Alex Russell‏ @slightlylate 28 Oct 2019
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      Replying to @slightlylate @kosamari @yamaha_bike

      Any ideas, @eae?

      1 reply 0 retweets 0 likes
    5. Monica Dinculescu‏ @notwaldorf 31 Oct 2019
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      Replying to @slightlylate @kosamari and

      My guess (bc I want the answer and I’m baiting @eae with a likely incorrect one) is that it does the whole blink-harfbuzz-skia dance for every char and needs to fallback through bad serifs until it gets to one with the glyph, but the OS arial/helvetica should have it so 🤷‍♀️

      1 reply 0 retweets 2 likes
    6. Emil A Eklund‏ @eae 31 Oct 2019
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      Replying to @notwaldorf @slightlylate and

      Pretty close, you've been paying attention @notwaldorf, I'm impressed!

      2 replies 0 retweets 2 likes
    7. Emil A Eklund‏ @eae 31 Oct 2019
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      Replying to @eae @notwaldorf and

      Font fallback in Chrome works by trying to shape with the first specified font-family then falling back to subsequent ones for each run of glyphs where the first one did not have sufficient coverage.

      1 reply 0 retweets 6 likes
    8. Emil A Eklund‏ @eae 31 Oct 2019
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      Replying to @eae @notwaldorf and

      In cases where none of the specified fonts have coverage we query the OS for an appropriate font for the first glyph in the "unshaped" sequence and shape as much of the remainder with that.

      1 reply 0 retweets 2 likes
    9. Emil A Eklund‏ @eae 31 Oct 2019
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      Replying to @eae @notwaldorf and

      The behavior of the yamaha-motor site is pretty typical in that none of the specified fonts have coverage for Japanese characters, but has coverage for the space character, triggering OS level fallback for each "word".

      1 reply 0 retweets 2 likes
    10. Emil A Eklund‏ @eae 31 Oct 2019
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      Replying to @eae @notwaldorf and

      The way to fix this is to either specify a font-family that has full coverage for Japanese, or to not specify a font at all, triggering a locale specific default.

      1 reply 0 retweets 1 like
      Alex Russell‏ @slightlylate 31 Oct 2019
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      Replying to @eae @notwaldorf and

      Is there a way to diagnose this pathology in devtools? /cc @hashseed @paul_irish

      7:34 PM - 31 Oct 2019
      • 1 Like
      • Yang Guo (郭扬)
      1 reply 0 retweets 1 like
        1. New conversation
        2. Emil A Eklund‏ @eae 31 Oct 2019
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          Replying to @slightlylate @notwaldorf and

          Yes and it's really easy. The devtools team has done a fantastic job surfacing font-related issues over the last few years. Inspect the element with the text content and check then "Rendered Fonts" section of the "Computed" styles tab. Ideally this should list a single font.

          2 replies 0 retweets 2 likes
        3. Alex Russell‏ @slightlylate 1 Nov 2019
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          Replying to @eae @notwaldorf and

          TIL!

          0 replies 0 retweets 0 likes
        4. End of conversation

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