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Standardized CSS zoom

Category

CSS

Type

New or changed feature

Status

In developer trial (Behind a flag) (Chrome 128)

Intent stage

None

Summary

Updates the existing implementation of the previously non-standard CSS zoom property to align with the new standard. This changes various JS APIs to align with the spec (see design doc), changes zoom to apply to iframe content documents, and changes it to apply to all inherited length properties (previously it only changed inherited font-size).

Motivation

Aligns the existing implementation of the previously non-standard CSS zoom property to align with the new standard. This changes various JS APIs to align with the spec (see design doc), change zoom to apply to iframes, and change it to apply to all inherit length properties (currently it only changes inherited font-size)

Standards & signals

• Specification: https://github.com/w3c/csswg-drafts/pull/9699
• Firefox: No signal — Filed a standard position request: https://github.com/mozilla/standards-positions/issues/977
• Safari: No signal — Filed a standard position request: https://github.com/WebKit/standards-positions/issues/311
• Web developers: Positive — Research collected as part of the previous attempt to remove CSS zoom demonstrated several use cases.

Docs: https://docs.google.com/document/d/1AcnDShjT-kEuRaMchZPm5uaIgNZ4OiYtM4JI9qiV8Po/edit

Samples: https://jsbin.com/wasafateko/edit?html,css,js,output

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