Question

我正在这里的Reacts官方网站上关注instructions。我的index.css目录的根目录中有一个src文件设置，导入方式为：

@import-normalize;

然后我将index.css文件导入我的App组件：

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

class App {}

尽管样式表确实存在，但它仅部分加载重置内容而不是全部内容。我在文档中看不到添加/减去所需内容的选项。在下面，您可以看到添加的内容。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）首先是由于create 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/删除的样式。最新版本的CRA使用以下浏览器列表开发配置：

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

如果将生产配置复制到开发中，则会看到一些添加的样式。例如，将overflow: visible;添加到Edge和IE的hr元素中。如果您想更清楚地了解项目中将包含哪些内容，以及它们之间是否相距太远，请运行构建并签出static/css/*main.randomletters.chunk块文件。

2） Postcss-normalize doesn't actually point在您链接的necolas / normalize.css样式表上。相反，它指向@csstools/normalize.css。 您会注意到许多差异。 postcss-normalize（共同创建normalize）的作者说，由于necolas / normalize版本包含“ non-fixes”，因此该版本的维护更为积极。我还没有研究足够的知识来知道它们是否实际上是未修复的，但是您可以在这里看到他说的话：https://github.com/csstools/normalize.css/issues/3。如果安装了yarn remove normalize.css，请随时使用！

Normalize.css未完全添加重置以响应应用

1 个答案: