css file modification

In website development, CSS (Cascading Style Sheets) is an integral part, which is responsible for the style and layout of the website. However, the website will continue to change during the development process, and CSS files need to be modified to adjust the style and layout. This article will introduce how to follow best practices when modifying CSS files to ensure the effectiveness and maintainability of modifications.

1. Back up the original file

Before modifying the CSS file, we should first back up the original file. In this way, we can not only ensure that we can restore to the original state if a problem occurs, but also view the style and layout before modification in the backup.

2. Comment modification

When modifying CSS files, we should add comments for each modification so that other developers can understand our modifications. Comments should include the purpose and reason for the modification, as well as other styles or layouts that may be affected.

For example, if we want to modify the border style of an element, we can comment like this:

/ Modify the border style because the previous border is not coordinated with other elements /

3. Use semantic naming

CSS style selectors should use semantic naming so that other developers can understand our code. We should choose a suitable name for each selector so that it is easy to understand while reading the code.

For example, if we want to modify the style of a button, we can use the following semantic naming:

.button {
/ Button style/
}

4. Avoid using id selectors

In CSS, id selectors have high priority. However, when modifying CSS files, we should avoid using id selectors as they can cause problems in later styling and layout adjustments. We should give preference to class selector or tag selector.

For example, if we want to modify the style of a button, we should not use the id selector:

button {

/ Button style/
}

Instead, use the class selector:

.button {
/ The style of the button/
}

5. Optimize style rules

When modifying CSS files, we should optimize style rules so that they can run more streamlined and efficiently. We should avoid duplicate style rules and unnecessary selectors.

For example, if we want to modify the style of two different elements, we should use a common class selector instead of defining a style rule for each of them:

.header {
/ Style of element 1/
}

.sidebar {
/ Style of element 2/
}

6. Separate public styles

When modifying CSS files, we should separate public styles for reuse and maintenance. We can save the common styles in a separate css file and reference it in all pages of the website.

For example, if we want to modify the style of the navigation bar, we can save the public navigation bar style in a separate css file and reference it in all pages:

/ In common.css/
.nav {
/ Navigation bar style/
}

/ In index.html/
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7. Using preprocessor

When modifying CSS files, we can use CSS preprocessors to improve efficiency and maintainability. CSS preprocessors allow us to use features such as variables, functions, and nested rules to make the code more concise and easier to maintain.

For example, when using the Sass preprocessor, we can define variables and nested rules like this:

/ Define color variables /
$primary-color : #333;

/ Nested rules/
.nav {
background-color: $primary-color;
ul {

li {
  /* 子菜单的样式 */
}

}
}

In short, when modifying CSS files, we should follow best practices to ensure the effectiveness and maintainability of modifications. We should back up the original file, comment out changes, use semantic naming, avoid using id selectors, optimize style rules, separate common styles and use preprocessors. These practices will help us write high-quality CSS files.

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