• In CSS, a section enclosed by an opening ({) and a closing curly brace (}).
• In JavaScript, a collection of related statements enclosed by an opening ({) and a closing curly brace (}). ← MDN Web Docs
• → Block box
• → Block container box
• → Block container element
• → Block-level box
• → Block-level element

1. Related terms: Declaration block · Anonymous block box · Containing block · Block flow
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