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CSS Specificity Calculator

The CSS Specificity Calculator breaks down any CSS selector into its specificity score (IDs, classes, elements) and renders a visual comparison card using Bootstrap 5. Paste one or more selectors, configure display options, and get a ready-to-embed specificity reference widget — ideal for documentation sites, style guides, and teaching materials.

Configuration

Content

Design

8

Layout

How to Use

1. Enter one or more CSS selectors in the Selectors field, one per line, and fill in the tool title and description. 2. Adjust design settings — choose a theme, set the accent color, border radius, and whether to show a specificity bar. 3. Preview the rendered Bootstrap 5 specificity card in real time. 4. Copy or download the generated HTML and drop it into any Bootstrap 5 project.

Why Use This Tool?

Specificity bugs are among the most time-consuming CSS issues to debug — this tool gives you an instant, shareable breakdown without installing any npm packages or writing a single line of JavaScript. The output is pure Bootstrap 5 HTML, so it embeds cleanly into documentation, onboarding wikis, or PR comments with zero extra dependencies.

Frequently Asked Questions

What is the CSS Specificity Calculator?
It is an online tool that parses CSS selectors you provide, calculates their specificity scores (ID, class/attribute/pseudo-class, element/pseudo-element), and generates a styled Bootstrap 5 HTML card you can embed anywhere.
How is CSS specificity scored and why does the order matter?
CSS specificity is represented as three numbers: (A, B, C) where A counts ID selectors, B counts class, attribute, and pseudo-class selectors, and C counts type/element and pseudo-element selectors. A selector with a higher A value always wins over one with a higher B or C value, regardless of source order — so \`#nav a\` (1,0,1) beats \`.nav a.active\` (0,2,1) even if the class rule appears later in the stylesheet. Understanding this hierarchy prevents you from reaching for \`!important\` unnecessarily.
Is it free?
Yes — the CSS Specificity Calculator is completely free with no signup required. Built by the CanvasBuilder.co team.