How Can I Get the Browser Viewport Dimensions Using JavaScript?

How to Acquire the Dimensions of the Browser Viewport

Background:

Browsers display content within a designated area known as the "viewport". This area excludes the address bar, toolbars, and other UI elements. In certain scenarios, developers may need to determine the exact size of the viewport to offer users an optimal viewing experience.

Solution:

There are several methods to retrieve the dimensions of the browser viewport using JavaScript:

1. 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)

2. window.innerWidth and window.innerHeight:

These properties directly return the width and height of the CSS viewport, including scrollbars. However, note that these values may vary on mobile devices due to scaling issues.

3. document.documentElement.clientWidth and .clientHeight:

These properties calculate the width and height of the viewport excluding scrollbar width. They align with the @media values when there's no scrollbar present.

Additional Information:

• The methods outlined above are cross-browser compatible and widely supported.
• Resources are available online for testing the live outputs of various viewport dimensions.
• Third-party libraries like "verge" and "actual" provide convenient abstractions for obtaining accurate viewport dimensions in any desired unit of measurement.

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