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
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.
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Add this Tweet to your website by copying the code below. Learn more
Add this video to your website by copying the code below. Learn more
By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.
| Country | Code | For customers of |
|---|---|---|
| United States | 40404 | (any) |
| Canada | 21212 | (any) |
| United Kingdom | 86444 | Vodafone, Orange, 3, O2 |
| Brazil | 40404 | Nextel, TIM |
| Haiti | 40404 | Digicel, Voila |
| Ireland | 51210 | Vodafone, O2 |
| India | 53000 | Bharti Airtel, Videocon, Reliance |
| Indonesia | 89887 | AXIS, 3, Telkomsel, Indosat, XL Axiata |
| Italy | 4880804 | Wind |
| 3424486444 | Vodafone | |
| » See SMS short codes for other countries | ||
This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.
Hover over the profile pic and click the Following button to unfollow any account.
When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.
The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.
Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.
Get instant insight into what people are talking about now.
Follow more accounts to get instant updates about topics you care about.
See the latest conversations about any topic instantly.
Catch up instantly on the best stories happening as they unfold.
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
Any ideas, @eae?
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 
Pretty close, you've been paying attention @notwaldorf, I'm impressed!
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.
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.
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".
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.
Is there a way to diagnose this pathology in devtools?
/cc @hashseed @paul_irish
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.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.