CSS Contain Generator
Generate CSS contain property for performance optimization. Configure layout, paint, size, style containment or use strict/content shorthand values with live CSS output.
How to Use CSS Contain Generator
The CSS Contain Generator helps you create CSS contain property declarations for performance optimization. The contain property tells the browser that an element and its contents are independent from the rest of the document tree, enabling rendering optimizations. Choose from individual values (layout, paint, size, style) or shorthand values (strict = layout + paint + size, content = layout + paint). Enter your CSS selector and toggle the containment options to generate ready-to-use CSS. Ideal for optimizing complex pages with many independent widgets or components.
Step-by-Step Instructions
- Enter your CSS selector (e.g. .card, .widget)
- Choose strict/content shorthand or individual containment values
- Toggle layout, paint, size, and style as needed
- Copy the generated CSS contain declaration
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