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Window.devicePixelRatio

- WD

Read-only property that returns the ratio of the (vertical) size of one physical pixel on the current display device to the size of one CSS pixel.

Chrome

  1. ✅ 4 - 132: Supported
  2. ✅ 133: Supported
  3. ✅ 134 - 136: Supported

Edge

  1. ✅ 12 - 132: Supported
  2. ✅ 133: Supported

Safari

  1. ✅ 3.1 - 18.2: Supported
  2. ✅ 18.3: Supported
  3. ✅ 18.4 - TP: Supported

Firefox

  1. ❌ 2 - 17: Not supported
  2. ✅ 18 - 134: Supported
  3. ✅ 135: Supported
  4. ✅ 136 - 138: Supported

Opera

  1. ❌ 9 - 11.5: Not supported
  2. ✅ 11.6 - 113: Supported
  3. ✅ 114: Supported

IE

  1. ❌ 5.5 - 10: Not supported
  2. ✅ 11: Supported

Chrome for Android

  1. ✅ 133: Supported

Safari on iOS

  1. ✅ 3.2 - 18.2: Supported
  2. ✅ 18.3: Supported
  3. ✅ 18.4: Supported

Samsung Internet

  1. ✅ 4 - 26: Supported
  2. ✅ 27: Supported

Opera Mini

  1. ✅ all: Supported

Opera Mobile

  1. ❌ 10 - 11.5: Not supported
  2. ✅ 12 - 12.1: Supported
  3. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ✅ 2.1 - 4.4.4: Supported
  2. ✅ 133: Supported

Firefox for Android

  1. ✅ 135: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ✅ 3: Supported

As the page is zoomed in the number of device pixels that one CSS pixel covers increases, and therefore the value of devicePixelRatio will also increase.

Resources:
MDN Web Docs - devicePixelRatio