


Comment tags are supported in all browsers.
The comment tag is used to insert comments in the source code. Comments will not be displayed in the browser.
You can use comments to explain your code, which will help you edit the code at a later time. Especially useful when you write a lot of code.
It is also a good habit to use comment tags to hide scripts that are not supported by the browser (so that the script will not be displayed as plain text). How to comment the html, css, and js codes specifically? The following is a summary of usage examples of html, css, and js comments!
1. Understand html, css, js comments
1. Html commentsHtml Introduction to the symbols for marking text comments in Html
In this article, let’s learn about the symbols for marking text comments in Html
HTML comments, we often have to make some HTML next to some code Note, there are many benefits to doing this, such as: it is convenient to search, it is convenient to compare, it is convenient for other programmers in the project team to understand your code, and it is also convenient for you to understand and modify your own code in the future, etc.
Start using
2. Conditional comments in HTML
Previous words
IE conditional comment is a non-standard logical statement provided by Microsoft since IE5. Its function is to flexibly import different html elements for different IE versions of browsers. Obviously, the biggest advantage of this method is that it is a compatible solution officially given by Microsoft and can also identify IE
through W3C verification
Because starting from IE10, the IE browser no longer Conditional comments are now supported. Therefore, the following writing method can only recognize IE9-browser
[Note] There must be no space between the two -- and the left bracket [, otherwise it will be invalid
3. Share An example of how Translater.JS cleverly uses HTML comments to translate pages
Follow JSDigs to give you something to do occasionally.
This is a page translation solution that utilizes HTML comments. For a small number of static pages, this solution appears simpler. It has no dependencies and is only compressed (~2kb).
2. Specific usage examples of html, css, and js comments
1. Introduction to some advanced usage of CSS comments
Quasi-qualified selectors
You should avoid over-qualified selectors. For example, if you can write .nav{}, try not to write ul.nav{ }. Excessive modification of selectors will affect performance, affect class reusability, and increase selector privacy. These are things you should try to avoid.
But sometimes you may want to tell other developers the scope of use of a class. Taking .product-page as an example, this class looks like a root container, which may be an html or body element, but it cannot be determined based on .product-page alone.
2. Standard usage of html, css and js comments
Add necessary comments, a good habit that a responsible and ethical front-end must have , which can greatly improve the maintainability and readability of the code. The editor below will introduce to you a summary of the standard usage of html, css and js comments. Friends who need it can refer to it
3. HTML comments - learn HTML+CSS at your fingertips
What are code comments? The function of code comments is to help programmers mark the purpose of the code. If you look at the code you wrote after a while, you can quickly remember the purpose of this code. Code comments not only make it easier for programmers to recall the purpose of previous code, but also help other programmers quickly understand the functions of your program, making it easier for multiple people to collaborate on developing web page code.
3. Related questions and answers
1. What is the shortcut key for adding comments in CSS?
[Related recommendations]
2. C# Example of method to remove comments based on regular expression
3. View java source code and detailed introduction of comment method
The above is the detailed content of How to comment html, css, js code? Summary of usage of html, css, and js comments. For more information, please follow other related articles on the PHP Chinese website!

本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

不算。html是一种用来告知浏览器如何组织页面的标记语言,而CSS是一种用来表现HTML或XML等文件样式的样式设计语言;html和css不具备很强的逻辑性和流程控制功能,缺乏灵活性,且html和css不能按照人类的设计对一件工作进行重复的循环,直至得到让人类满意的答案。

总结了一些web前端面试(笔试)题分享给大家,本篇文章就先给大家分享HTML部分的笔试题(附答案),大家可以自己做做,看看能答对几个!

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

在html中,document是文档对象的意思,代表浏览器窗口的文档;document对象是window对象的子对象,所以可通过“window.document”属性对其进行访问,每个载入浏览器的HTML文档都会成为Document对象。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

3种取消方法:1、给td元素添加“border:none”无边框样式即可,语法“td{border:none}”。2、给td元素添加“border:0”样式,语法“td{border:0;}”,将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式,语法“td{border:transparent;}”,将td边框的颜色设置为透明即可。


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