使用CSS重置能消除瀏覽器間默認樣式的差異，確保頁面在不同瀏覽器中表現(xiàn)一致。 1. 使用CSS重置可解決如h1外邊距、ul縮進、段落間距等渲染不一致問題；2. 常見方案包括Eric Meyer Reset（徹底清除樣式）、Normalize.css（標準化而非清除）和現(xiàn)代輕量重置（如使用box-sizing和unset）；3. 從零開發(fā)時推薦使用重置或標準化方案，而使用Tailwind或Bootstrap等框架時可依賴其內(nèi)置基線樣式。因此，儘管現(xiàn)代開發(fā)中CSS重置非必需，但理解其原理有助於實現(xiàn)跨瀏覽器的一致性設(shè)計。

A CSS reset is a technique used to remove or standardize the default styling that browsers apply to HTML elements. Every browser has its own built-in stylesheet (called a user agent stylesheet ) that gives basic formatting to elements like headings, margins, padding, lists, and links. These defaults can vary between browsers, which may lead to inconsistencies in how your page looks across different platforms.

A CSS reset aims to create a clean, consistent starting point by "resetting" these default styles so you can build your design from a predictable baseline.

Why Use a CSS Reset?

Without a reset:

• <h1></h1> might have different margins in Chrome vs Firefox.
• Unordered lists ( <ul></ul> ) have built-in left padding and bullets that vary slightly.
• Paragraphs may have inconsistent spacing.

These small differences can add up and make your site look off in certain browsers.

Using a reset eliminates these inconsistencies early, so your custom CSS behaves more predictably.

Common Types of CSS Resets

There are a few popular approaches:

• Eric Meyer Reset – One of the most well-known, it resets most element styles aggressively:

   * { margin: 0; padding: 0; border: 0; }

  (Simplified example — the full version is more comprehensive.)

• Normalize.css – Not a reset per se, but a popular alternative. Instead of removing all styles, it makes them consistent across browsers. It preserves useful defaults and fixes bugs.

• Modern CSS Reset (Minimal) – A lighter, modern approach using *, *::before, *::after and unset :

   *,
  *::before,
  *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  body {
    line-height: 1.5;
  }
  img {
    display: block;
    max-width: 100%;
  }

When Should You Use One?

• Yes , if you're building a site from scratch and want full control.
• Consider Normalize.css , if you'd like to keep some sensible defaults (like semantic heading sizes) while fixing cross-browser quirks.
• Maybe not , if you're using a modern framework (like Tailwind or Bootstrap), which often includes its own reset or base styles.

Basically, a CSS reset isn't always required today, but understanding it helps you control how your site looks everywhere. Most developers use some form of reset or base styling — whether it's a full reset, normalize, or a custom baseline.

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