## How to Determine Screen Resolution Accurately in JavaScript: A Cross-Browser Approach?

Determining Screen Resolution with JavaScript

In the world of web development, accurately detecting the screen resolution of a user's device is crucial. To ensure compatibility across various browsers, it's important to find a universal solution.

A Cross-Browser Approach

For browsers supporting the latest specifications, the most reliable method to obtain the screen resolution is:

<code class="js">window.screen.availHeight
window.screen.availWidth</code>

These properties provide the available height and width of the screen, excluding any browser chrome or toolbars. The avail attribute ensures that the resolution reflects the actual usable workspace for the webpage.

Native Resolution on Mobile Devices

For mobile devices, the device pixel ratio needs to be taken into account to determine the native resolution:

<code class="js">window.screen.width * window.devicePixelRatio
window.screen.height * window.devicePixelRatio</code>

This adjustment is necessary to compensate for the higher pixel density on mobile displays.

Distinction Between Available and Absolute Resolution

In addition to the available screen resolution, browsers also provide the absolute height and width of the physical screen:

<code class="js">window.screen.height
window.screen.width</code>

The absolute resolution includes any non-webpage content, such as browser controls or menu bars.

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