How Do `html`, `body`, and the Universal Selector (*) Differ in CSS Selector Precedence?-CSS Tutorial-php.cn

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How Do `html`, `body`, and the Universal Selector (*) Differ in CSS Selector Precedence?

Nov 28, 2024 pm 12:06 PM

How Do `html`, `body`, and the Universal Selector (*) Differ in CSS Selector Precedence?

CSS Selector Precedence: html, body, and the Universal Selector* (Updated)

The question arises: how do three rules differ when applied to the same HTML document? Let's explore the distinctive effects of these selectors: html, body, and the universal selector *.

html Selector:

<pre>

color: black;
background-color: white;

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}
</pre>

This rule applies color and background styles to the <html> element. Its descendants inherit the color but not the background, including the <body> element. The <body> element lacks a default background, making it transparent, revealing the <html> background.

Despite covering the entire viewport, the <html> element's background does not automatically extend its height; it simply permeates the viewport.

body Selector:

<pre>

color: black;
background-color: white;

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}
</pre>

This rule applies color and background styles to the <body> element. All its descendants inherit its color.

Similar to the <html> background, the <body> background is automatically propagated to the <html> element unless explicitly overridden. Therefore, when using a single background, placing it on either the <html> or <body> elements yields no significant difference.

However, combining background styles for <html> and <body> can produce unique effects, as demonstrated here.

Universal Selector (*):

<pre>

color: black;
background-color: white;

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}
</pre>

This rule affects every element, nullifying any implicit inheritance. But it's easily overridden by other rules, including the <html> and <body> rules, due to its lack of specificity.

Breaking inheritance with the universal selector is generally discouraged unless absolutely necessary (typically for specific, isolated elements) due to its potential to disrupt inheritance chains for all affected properties.

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