What is my viewport?
The viewport is the visible area of the page inside your browser window. It updates when you resize the window or rotate the device.
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Viewport
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FAQ
The viewport is the visible browser content area measured with window.innerWidth and innerHeight in CSS pixels.
Resizing the window or rotating a phone changes the visible area, so the viewport updates.
No. Screen resolution is the full display. The viewport is only the browser content area.
Yes. Address bars and toolbars reduce the viewport height, especially on mobile.
Responsive layouts, media queries, and sticky headers are based on viewport size, not full screen resolution.