---
title: "Viewport (Help Center / Filters / Browser)"
canonical: "https://www.rumvision.com/help-center/filters/browser/viewport/"
---

Breadcrumbs: [Home](https://www.rumvision.com/?format=md) > [Help Center](https://www.rumvision.com/help-center/?format=md) > [Filters](https://www.rumvision.com/help-center/filters/?format=md) > [Browser](https://www.rumvision.com/help-center/filters/browser/?format=md) > Viewport

# Viewport

The visible area of a web page displayed within a user's browser window.

## Using the viewport filter

For the Cumulative Layout Shift, it is useful to rule out whether it occurs only on a specific viewport. This could be a particular viewport for a smartphone, or it could be the difference between a 13-inch and 15-inch laptop.

![viewport-rumvision.png](https://www.rumvision.com/file/upload/img/screenshot/viewport-rumvision.png)