CSS zoom

- WD

Method of scaling content while also affecting layout.

Chrome

✅ 4 - 156: Supported
✅ 157: Supported
✅ 158 - 160: Supported

Edge

✅ 12 - 155: Supported
✅ 156: Supported

Safari

❌ 3.1 - 3.2: Not supported
✅ 4 - 27.1: Supported
✅ 27.2: Supported
✅ 27.3 - TP: Supported

Firefox

❌ 2 - 125: Not supported
✅ 126 - 159: Supported
✅ 160: Supported
✅ 161 - 163: Supported

Opera

❌ 9 - 12.1: Not supported
✅ 15 - 138: Supported
✅ 139: Supported

IE

✅ 5.5 - 7: Supported
✅ 8 - 10: Supported
✅ 11: Supported

Chrome for Android

✅ 157: Supported

Safari on iOS

❌ 3.2: Not supported
✅ 4 - 26.6: Supported
✅ 27.0: Supported
✅ 27.1 - 27.2: Supported

Samsung Internet

✅ 4 - 30: Supported
✅ 31: Supported

Opera Mini

❌ all: Not supported

Opera Mobile

❌ 10 - 12.1: Not supported
✅ 80: Supported

UC Browser for Android

✅ 15.5: Supported

Android Browser

✅ 2.1 - 4.4.4: Supported
✅ 157: Supported

Firefox for Android

✅ 160: Supported

QQ Browser

✅ 14.9: Supported

Baidu Browser

✅ 13.52: Supported

KaiOS Browser

❌ 2.5: Not supported
❌ 3: Not supported

Originally implemented only in Internet Explorer. Note that transform: scale() does not work the same as zoom. If e.g. transform: scale(0.6) is used on the html or body element then it resizes the entire page, showing a minified page with huge white margins around it, whereas zoom: 0.6 scales the elements on the page, but not the page itself on which the elements are drawn.

Resources:: CSS Tricks; Safari Developer Library; MDN Web Docs - CSS zoom; Article explaining usage of zoom as the hack for fixing rendering bugs in IE6 and IE7.