CSS @scope Generator
Free online CSS @scope generator. Build native CSS @scope at-rules with a root selector and an optional lower-bound selector to create donut scopes. Live preview, minify, copy, and download. 100% client-side, no signup.
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What is CSS @scope Generator?
The CSS @scope Generator is a free, browser-based tool that produces native CSS @scope at-rules for scoping styles to a specific DOM subtree. You choose a scope root selector whose descendants receive the styles, and optionally a lower-bound selector that stops the cascade from reaching certain children — creating the so-called donut scope. The generator sanitizes braces and at-rules from your declaration body so the output is always valid CSS, offers a minified mode for production, and ships with three presets for inline content, nested widgets, and modal dialogs. Everything runs locally in your browser, making it ideal for front-end developers, design-system teams, and component authors who need reliable style encapsulation without Shadow DOM.
Key Benefits
- Native CSS scoping without Shadow DOM, iframes, or heavy BEM conventions
- Optional lower-bound selector creates a donut scope to exclude nested children
- Sanitized declaration body guarantees valid, parseable CSS every time
- Minified production mode plus copy and download as a .css stylesheet
- Three presets cover inline content, nested widgets, and modal dialogs
Common Use Cases
- •Scope third-party widget styles so they do not leak into the host page
- •Style article body content without affecting sidebars, headers, or footers
- •Encapsulate modal dialog styles and exclude the backdrop from the cascade
- •Prototype design-system tokens that should only apply within a sandbox
- •Build progressively enhanced stylesheets using @supports alongside @scope
How to Use the CSS @scope Generator
- Set the Scope Root: Enter the selector for the element whose subtree you want to style, for example ".card" or ".post > p". Styles inside the @scope block will only apply to descendants of this element.
- Add an Optional Lower-Bound Selector: To stop the cascade from reaching certain descendants (a donut scope), type a lower-bound selector like ".no-scope" or "aside, footer". Leave it blank if you want the styles to apply to the entire subtree.
- Type Your CSS Declarations: Enter one or more CSS declarations such as "color: red;" or "padding: 12px;". The generator strips stray braces and at-rules so the output is always valid. Toggle Minify output for production CSS.
- Copy or Download: Review the generated @scope block in the output area, then click Copy to send it to your clipboard or Download to save it as a scoped.css file you can link from your stylesheet.
Key Features
- Scope root selector plus an optional lower-bound selector for donut scopes
- Live formatted CSS preview with one-click minified production output
- Three presets: inline content, nested widget, and modal dialog
- Copy to clipboard or download as a .css stylesheet
- Sanitizes braces and at-rules so the generated CSS is always valid
- 100% client-side processing with no API calls or uploads