Html Css Classes Ids — Free Html Tutorial

Learn Html Css Classes Ids in Html with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Html Css Classes Ids in Html with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 14, 2026

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Html Css Classes Ids in Html

class attribute: reusable, multiple per element, styled with .classname. id attribute: unique, one per element, styled with #idname.

Use classes for repeated styles (buttons, cards). Use ids for unique elements (main content, nav). Specificity: id > class > tag.

CSS selectors: .class { }, #id { }, element.class { }, #id .child { }, .class1.class2 { } (both classes).

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