How Can I Get Browser Viewport Dimensions Using JavaScript?

Detecting Browser Viewport Dimensions

Issue:

How can I determine the viewport size of a browser using JavaScript? This information is particularly beneficial for optimizing image quality based on the available display area.

Solution:

There are several approaches to obtain browser viewport dimensions:

Cross-browser: @media (width) and @media (height) Values

let vw = Math.max(document.documentElement.clientWidth || 0, window.innerWidth || 0);
let vh = Math.max(document.documentElement.clientHeight || 0, window.innerHeight || 0);

window.innerWidth and window.innerHeight

Properties:

• Retrieves CSS viewport dimensions including scrollbars
• May be unreliable on mobile devices due to initial-scale and zoom

document.documentElement.clientWidth and .clientHeight

Properties:

• CSS viewport width minus scrollbar width
• Matches @media dimensions with no scrollbar
• Cross-browser support
• Inaccurate without a doctype

Resources:

• [Live Outputs for Various Dimensions](https://jsfiddle.net/ariya/tvn3d/)
• [Verge](https://github.com/ryanseddon/verge)
• [actual.js](https://github.com/jsdom/actual)

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