css - Normalize.css 未完全添加重置以 react 应用程序

Question

我正在关注 instructions在 React 官方网站上。我在 src 目录的根目录中有一个 index.css 文件设置，导入如下:

@import-normalize;

然后，我将 index.css 文件导入到我的应用程序组件中:

import '../../index.css';

class App {}

虽然样式表确实存在，但它仅部分加载重置而不是完整的内容。我在文档中没有看到添加/减去您想要的内容的选项。您可以在下面看到添加的内容。现在将其与 full reset 进行比较.

/*! normalize.css v9.0.1 | MIT License | github.com/csstools/normalize.css */

/* Document
 * ========================================================================== */

/**
 * 1. Correct the line height in all browsers.
 * 2. Prevent adjustments of font size after orientation changes in
 *    IE on Windows Phone and in iOS.
 */

html {
  line-height: 1.15; /* 1 */
}

/* Sections
 * ========================================================================== */

/**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Firefox, and Safari.
 */

h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

/* Grouping content
 * ========================================================================== */

/**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */

hr {
  box-sizing: content-box; /* 1 */
  height: 0; /* 1 */
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */

pre {
  font-family: monospace, monospace; /* 1 */
  font-size: 1em; /* 2 */
}

/* Text-level semantics
 * ========================================================================== */

/**
 * Add the correct text decoration in Edge, IE, Opera, and Safari.
 */

abbr[title] {
  text-decoration: underline;
  text-decoration: underline dotted;
}

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */

b,
strong {
  font-weight: bolder;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */

code,
kbd,
samp {
  font-family: monospace, monospace; /* 1 */
  font-size: 1em; /* 2 */
}

/**
 * Add the correct font size in all browsers.
 */

small {
  font-size: 80%;
}

/* Embedded content
 * ========================================================================== */

/* Forms
 * ========================================================================== */

/**
 * Remove the margin in Safari.
 */

button,
input,
select {
  margin: 0;
}

/**
 * 1. Show the overflow in IE.
 * 2. Remove the inheritance of text transform in Edge, Firefox, and IE.
 */

button {
  text-transform: none; /* 2 */
}

/**
 * Correct the inability to style clickable types in iOS and Safari.
 */

button,
[type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
}

/**
 * Correct the padding in Firefox.
 */

fieldset {
  padding: 0.35em 0.75em 0.625em;
}

/**
 * 1. Add the correct display in Edge and IE.
 * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */

progress {
  vertical-align: baseline; /* 2 */
}

/**
 * Remove the inheritance of text transform in Firefox.
 */

select {
  text-transform: none;
}

/**
 * 1. Remove the margin in Firefox and Safari.
 * 2. Remove the default vertical scrollbar in IE.
 */

textarea {
  margin: 0; /* 1 */
}

/**
 * 1. Correct the odd appearance in Chrome and Safari.
 * 2. Correct the outline style in Safari.
 */

[type="search"] {
  -webkit-appearance: textfield; /* 1 */
  outline-offset: -2px; /* 2 */
}

/**
 * Correct the cursor style of increment and decrement buttons in Safari.
 */

::-webkit-inner-spin-button,
::-webkit-outer-spin-button {
  height: auto;
}

/**
 * Correct the text style of placeholders in Chrome, Edge, and Safari.
 */

::-webkit-input-placeholder {
  color: inherit;
  opacity: 0.54;
}

/**
 * Remove the inner padding in Chrome and Safari on macOS.
 */

::-webkit-search-decoration {
  -webkit-appearance: none;
}

/**
 * 1. Correct the inability to style clickable types in iOS and Safari.
 * 2. Change font properties to `inherit` in Safari.
 */

::-webkit-file-upload-button {
  -webkit-appearance: button; /* 1 */
  font: inherit; /* 2 */
}

/**
 * Remove the inner border and padding of focus outlines in Firefox.
 */

::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

/**
 * Restore the focus outline styles unset by the previous rule in Firefox.
 */

:-moz-focusring {
  outline: 1px dotted ButtonText;
}

/* Interactive
 * ========================================================================== */

/*
 * Add the correct display in Edge and IE.
 */

details {
  display: block;
}

/*
 * Add the correct styles in Edge, IE, and Safari.
 */

dialog {
  background-color: white;
  border: solid;
  color: black;
  display: block;
  height: -moz-fit-content;
  height: -webkit-fit-content;
  height: fit-content;
  left: 0;
  margin: auto;
  padding: 1em;
  position: absolute;
  right: 0;
  width: -moz-fit-content;
  width: -webkit-fit-content;
  width: fit-content;
}

dialog:not([open]) {
  display: none;
}

/*
 * Add the correct display in all browsers.
 */

summary {
  display: list-item;
}

/* Scripting
 * ========================================================================== */

/* User interaction
 * ========================================================================== */

Answer 1

有两个原因(第二个是主要原因)。

1) 第一个是由于创建 React 应用程序中的 browserslist 配置。 Postcss 使用浏览器列表配置来确定要保留/删除哪些样式。最新版本的 CRA 使用此 browserslist 开发配置:

"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"

如果您将生产配置复制到开发中，您将看到添加的一些样式。例如，overflow:visible; 被添加到 Edge 和 IE 的 hr 元素中。如果您想更清楚地了解将包含的内容并且在元素中距离不太远，请运行构建并查看 static/css/*main.randomletters.chunk block 文件。

2) Postcss-normalize doesn't actually point在您链接的 necolas/normalize.css 样式表中。相反，它指向 @csstools/normalize.css 。 您注意到的许多差异都会存在。 postcss-normalize 的作者(标准化的共同创建者)表示，由于 necolas/normalize 版本包含“非修复”，因此该版本得到了更积极的维护。我还没有进行足够的研究，不知道它们是否实际上是不可修复的，但你可以在这里看到他所说的:https://github.com/csstools/normalize.css/issues/3 。因此，如果您已安装，请随意yarn remove normalize.css!