css error

CSS (Cascading Style Sheets) is a very important part of web design. It can control the style, layout, color, etc. of a web page. It is one of the keys to achieving the beauty and readability of a web page. However, even skilled web designers will make some mistakes during the writing process of CSS. This article will introduce several common CSS mistakes and give corresponding solutions.

1. Grammar errors

Grammar errors are the most common errors in the CSS writing process. Syntax errors refer to grammatical structure errors in CSS code, such as spelling errors, grammatical errors, etc. Such errors will cause the CSS to fail to render and the web page to fail to display the desired effect.

Solution:

To solve syntax errors, you first need to be familiar with the common syntax structures of CSS, such as the basic format of "selector attribute name: attribute value;" and before writing CSS code Code should be repeatedly checked and verified for correctness.

2. Inaccurate selectors

Inaccurate selectors are one of the most common CSS errors. Such errors include selector type errors (for example, the ID selector is written as a class selector), selector name errors (for example, the selector "#nav" is written as "nav"), etc.

Solution:

To solve the error of inaccurate selectors, you need to write CSS selectors very carefully based on the individual element/tag names in the HTML document. At the same time, you need to pay attention to the type (ID, class, tag, etc.) and name of the selector to ensure that the selector can correctly identify the corresponding element in the HTML document.

3. Style attribute value error

Style attribute value error is a common type of CSS error. It usually refers to entering wrong parameters or specifying wrong metrics in CSS attribute values. Unit or percentage value. For example, write "width: abc" in CSS code, or write "margin: 100%" as "margin: 100px".

Solution:

In order to solve attribute value errors, international units (such as pixels, EM, etc.) need to be familiar with and mastered, find and correct wrong attribute values, or modify attribute values ​​​​to HTML documents and the impact of CSS style sheets.

4. Priority error

Priority error refers to an error in which the wrong priority is assigned to a CSS rule, causing the CSS code to fail to produce the expected results. Priority errors are often caused by incorrect ordering of CSS rules or inappropriate CSS property names.

Solution:

To avoid priority errors, CSS rules with the same priority should be placed together as much as possible, and avoid placing CSS rules with high priority at low priority. After CSS rules, standard CSS property names should be used wherever possible.

5. Undefined styles

In the process of web design, undefined styles are one of the common problems. This mainly arises due to the fact that many developers and designers do not fully define CSS style sheets. Undefined styles can cause some elements to not be displayed.

Solution:

To avoid the problem of undefined styles, you should use filesets to organize CSS style sheets whenever possible, and ensure that the style sheet is applied to every element of the document to ensure Each element has a specified style attribute.

In short, CSS errors are a problem that every web designer often encounters when designing web pages. To avoid these mistakes, web designers should be familiar with and master the basic syntax of CSS, selectors, property names, and international units, as well as write CSS according to the structure, elements, and markup of the document. Finally, they should always make corrections during the coding process. and check the code.

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