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Introduction & BasicsHTML ElementsAttributesHeadings & ParagraphsStyles & ColorsLinks (Anchors)Images & ResponsiveTablesListsBlock vs InlineClasses & IDsForms & Input TypesSemantic HTMLMeta Tags & SEOVideo & AudioPerformance OptimizationAccessibility (ARIA)Web APIs (Geo, D&D)
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Introduction & BasicsHTML ElementsAttributesHeadings & ParagraphsStyles & ColorsLinks (Anchors)Images & ResponsiveTablesListsBlock vs InlineClasses & IDsForms & Input TypesSemantic HTMLMeta Tags & SEOVideo & AudioPerformance OptimizationAccessibility (ARIA)Web APIs (Geo, D&D)

Classes & IDs

The class attribute is for reusable styles. The id attribute is for a unique element.
html
<div id="header">Unique Header</div>
<p class="error">Error Message 1</p>
<p class="error">Error Message 2</p>
IDs must be unique within the page. Classes can be used on multiple elements.
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