Web Development
web
mobile
css
What is Viewport?
Definition
The viewport is the visible area of a web page in the browser window. The HTML meta viewport tag (<meta name='viewport' content='width=device-width, initial-scale=1'>) controls how the page scales on mobile devices.
Why It Matters
Without a proper viewport meta tag, mobile browsers render pages at desktop width and then shrink them, making text unreadable. The viewport meta tag is required for responsive design to work. CSS viewport units (vw, vh) are relative to viewport size.