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HTML provides structure, but CSS controls presentation and styling.
CSS (Cascading Style Sheets) is used to control how HTML content looks when a browser renders it. While HTML structures a document, CSS determines the styling—such as text appearance, colors, spacing, and overall layout—so pages can be designed beyond the browser’s basic default styles. Browsers apply CSS by first converting the HTML into a DOM tree, then collecting CSS rules (from inline styles or external .css files), matching them to elements using selectors, and producing a render tree that is finally painted to the screen. CSS is rule-based: selectors target elements, and declaration blocks assign property/value pairs (e.g., setting heading color and font size).
HTML provides structure, but CSS controls presentation and styling.
Browsers use default stylesheet styles when no author-defined CSS is provided.
CSS rules use selectors and declaration blocks with property/value pairs to style targeted elements.
CSS is applied by matching CSS rules to the DOM tree, producing a render tree that the browser paints.
A stylesheet language used to define how HTML elements should be presented in a browser.
The part of a CSS rule that identifies which HTML elements the styles will apply to.
The section of a CSS rule enclosed in curly braces that contains one or more declarations.
A property/value pair inside a declaration block that sets a specific styling feature.
Basic styling rules built into the browser that make HTML readable even without author-defined CSS.
A browser representation of the HTML document structure created before CSS is applied.
The structure produced after CSS rules are applied to the DOM, used for painting the final page.
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