# What is Viewport? | Yungle glossary

> The viewport is the visible area of a webpage on a given device's screen.

Source: https://yungle.ai/glossary/viewport/

1.  [Resources](https://yungle.ai/resources)
2.  Glossary

Glossary · V

# Viewport

In plain words

The viewport is the visible area of a webpage on a specific device's screen, which varies by device size. Designing responsively for different viewports is a core requirement of mobile-first design.

Example

A page that fits a 1440 px desktop viewport also needs to work in a 390 px phone viewport without zooming or sideways scrolling.

Related resources

-   Glossary

    ## Mobile-First Design

    Mobile-first design means designing for the smallest screen first, then scaling up.

    [See term](https://yungle.ai/glossary/mobile-first-design)
-   Glossary

    ## Page Speed

    Page speed is how quickly a webpage's content loads and becomes usable for a visitor.

    [See term](https://yungle.ai/glossary/page-speed)
-   FAQ

    ## Is My Website Mobile-Friendly Enough?

    If your site takes more than 3 seconds to load on mobile, requires pinching to zoom, or has buttons too small to tap accurately, it's not mobile-friendly enough — and it's likely losing you both rankings and conversions. Over half of web traffic is mobile, and Google indexes your mobile version first. Test your actual site on a phone, not just a desktop preview. Small friction adds up fast on mobile.

    [See answer](https://yungle.ai/resources?type=faq#is-my-website-mobile-friendly-enough)
-   FAQ

    ## How Do I Optimize My Website for AI Search Engines Like ChatGPT?

    Write clear, self-contained answers to specific questions using structured formatting like headers and lists, build genuine topical authority around your subject area, and make sure your content is easy for AI crawlers to access and parse technically. AI tools like ChatGPT and Perplexity favor content that directly answers a question without requiring the reader to piece it together from a long article. This is the core of AEO, and it overlaps heavily with good traditional SEO practice.

    [See answer](https://yungle.ai/resources?type=faq#how-do-i-optimize-my-website-for-ai-search-engines-like-chatgpt)
-   Insight

    ## Core Web Vitals for B2B Websites Explained

    What Core Web Vitals measure, the thresholds Google uses, and how to build a B2B website that stays fast after launch instead of fixing it later.

    [Read insight](https://yungle.ai/insights/core-web-vitals-for-b2b-websites)

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