Contact emails
[email protected]<mailto:[email protected]>, 
[email protected]<mailto:[email protected]>
Explainer
None
Specification
https://www.w3.org/TR/css-grid-1/#track-sizing<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.w3.org%2FTR%2Fcss-grid-1%2F%23track-sizing&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xidna4CkKfxg4zMsoeMZaPiXwVEcD3zfdCZ4%2BSwUt8g%3D&reserved=0>
Summary

In CSS Grid, the grid-template-columns and grid-template-rows properties allow 
developers to define line names and track sizing of grid columns and rows, 
respectively. Supporting interpolation for these properties will allow grid 
layouts to smoothly transition between states, instead of snapping at the 
halfway point of an animation or transition. Web developers can use this 
functionality to achieve specific interactive effects without having to resort 
to driving animations via JavaScript.

Blink component
Blink>Layout>Grid<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.chromium.org%2Fp%2Fchromium%2Fissues%2Flist%3Fq%3Dcomponent%3ABlink%253ELayout%253EGrid&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ijYLR0%2BqEHV9TK1w4p6dUQZTb4AAf%2F6hbJNigBUEZ6U%3D&reserved=0>
TAG review

TAG review status
Not applicable. We don't believe this merits TAG review - it fits into the 
existing framework of CSS Animations/Transitions and it has been in the CSS 
Grid spec for years. But we're happy to file a request if API_OWNERS feel this 
change should have one.
Risks

Interoperability and Compatibility

Gecko: Shipped since 2019
WebKit: Recently implemented in preview 
https://bugs.webkit.org/show_bug.cgi?id=204580<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.webkit.org%2Fshow_bug.cgi%3Fid%3D204580&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=s%2B5cm1u9Ev3Q0P%2BgaaNUbVpoSN7YxCZSZ%2BSXxRPA0LE%3D&reserved=0>
Web developers: Positive (383 stars)
Other signals: N/A

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?
No
Debuggability
Existing grid support in devtools will allow inspection of the grid tracks 
created by the grid-template property values.

Is this feature fully tested by 
web-platform-tests<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchromium.googlesource.com%2Fchromium%2Fsrc%2F%2B%2Fmain%2Fdocs%2Ftesting%2Fweb_platform_tests.md&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=b0Y8R1uLUgCUCzVZtHLsLW12SSj4GinRbw85xmoWvJg%3D&reserved=0>?
Yes. 
https://wpt.fyi/results/css/css-grid/animation?label=experimental&label=master&aligned<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwpt.fyi%2Fresults%2Fcss%2Fcss-grid%2Fanimation%3Flabel%3Dexperimental%26label%3Dmaster%26aligned&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=UWPxkc3%2FIQy5eJWhNkQ5CxU5SYe1AfSSfA1OiIQB5es%3D&reserved=0>
Flag name
--enable-blink-features=CSSGridTemplatePropertyInterpolation
Requires code in //chrome?
False

Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=759665<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.chromium.org%2Fp%2Fchromium%2Fissues%2Fdetail%3Fid%3D759665&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xSa0Nyhok8HU2Azh%2FhQ5vuS21Sh45ipG%2BwgVPpq%2BENM%3D&reserved=0>

Estimated milestones

No milestones specified

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6037871692611584<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchromestatus.com%2Ffeature%2F6037871692611584&data=05%7C01%7CAna.Sollano%40microsoft.com%7Cb0a2fbe347734699403a08da3815ec92%7C72f988bf86f141af91ab2d7cd011db47%7C0%7C0%7C637883964057764552%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Un0P6tjq0ARKUWsn51chYU10v6Ev57Tb%2BJzNUFDDHJc%3D&reserved=0>

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