Html get user screen resolution

function getResolution() {
  const realWidth = window.screen.width * window.devicePixelRatio;
  const realHeight = window.screen.height * window.devicePixelRatio;
  console.log(`Your screen resolution is: ${realWidth} x ${realHeight}`);
}

// test
getResolution();
// Your screen resolution is: 3840 x 2160

Source: stackoverflow.com

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