CSS reset ensures that web pages display consistently in different browsers by resetting the browser's default style. Browser default style differences will affect the layout, such as title margins, paragraph line heights, etc. CSS reset can eliminate these differences, improve style consistency, and reduce debugging time. Common methods include: 1. The basic reset uses wildcard selector to reset the margin and padding of all elements, but may affect performance; 2. Eric Meyer Reset lists specific elements for more granular control, suitable for large projects; 3. Normalize.css does not completely clear the style but uniformly repairs the default style, suitable for situations where you want to retain useful default styles. The selection method depends on the project type: wildcard reset is available for small projects, Eric Meyer Reset or Normalize.css is recommended for medium and large projects. When using CSS frameworks, there is usually no need to introduce additional resets.
CSS reset stylesheet is a way to ensure that web pages appear consistently in different browsers by resetting the browser's default style. By default, each browser has subtle differences in the style processing of HTML elements, such as the upper and lower margins of the title, the line height of the paragraph, the indentation of the list, etc. If not uniformly processed, these differences may cause the page to look different in different browsers.

The core goal of a CSS reset stylesheet is to "clear" these default styles, allowing developers to start designing from a more "clean" starting point rather than debugging various unexpected style issues in different browsers.
Why do I need a CSS reset?
In order to improve user experience, the browser will add some default styles to HTML elements. For example, Chrome may add 21px margin to the <h1></h1>
tag, while Firefox may be 20px. These differences may have affected the page layout without you noticing them.

Using CSS reset can:
- Eliminate browser default style differences
- Improve style consistency, especially in layout, margins, font size, etc.
- Reduce cross-browser debugging time
Common reset methods include setting the margin and padding of all elements to 0, clearing the list style, uniform font size, etc.

Common CSS reset methods
1. The most basic way to write reset
* { margin: 0; padding: 0; box-sizing: border-box; }
This is a very common way to write it, using wildcard selector *
to reset margin and padding for all elements. box-sizing: border-box;
is to make the width of the element include padding and border, so that it is easier to control the size when laying out.
However, this writing has a disadvantage: it affects all elements, including pseudo-elements, and can cause performance problems, especially in large projects.
2. More fine reset (such as Eric Meyer Reset)
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small strike strong sub sup tt var b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embedded, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; }
This is the classic Eric Meyer Reset that explicitly lists all common HTML elements and resets their styles. This method is more controllable and more suitable for large-scale projects.
3. Use Normalize.css
Unlike reset, Normalize.css does not completely clear the style, but makes the browser's default style more consistent and modern. For example, it will fix some bugs and unify the default style of HTML5 elements, rather than simply and roughly clear all of them.
Normalize is a good choice if you want to keep some useful default styles (such as <sup></sup>
and <sub></sub>
typesettings) while also wanting to eliminate browser differences.
How to choose the reset method that suits you?
There is no standard answer to this question, mainly depends on your project type and development habits:
- If it's a small project or a rapid prototype: use wildcard reset (
* { margin: 0; padding: 0 }
) enough - If it is a medium-sized project or pursues precise control: it is recommended to use Eric Meyer Reset or similar methods
- If you want to keep the default style and want to unify behavior: use Normalize.css
- If you use CSS frameworks (such as Tailwind CSS, Bootstrap): they usually come with reset or base styles and do not require additional introductions
A practical suggestion is: first understand the problems caused by the default style differences, and then decide whether reset is really needed. Some projects do not actually need to reset all elements, and resetting only key parts (such as titles, paragraphs, lists) is enough.
Basically that's it.
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