html % escape

When writing HTML, there are some characters that require special processing. These characters may be misunderstood by the HTML parser as tags or other parts of the syntax, causing unnecessary errors. In order to solve this problem, HTML provides an escaping mechanism that can use special character sequences to represent these characters to avoid characters being misunderstood by the parser.

Among them, the percent sign (%) is also one of the characters that needs to be escaped. In HTML, the percent sign is usually used to represent special characters and parameters in the URL, such as "" represents a space character, "&" represents the "&" character, and so on. If these characters are not escaped, they may be regarded as characters with special meanings in the URL, thus affecting the parsing and use of the URL.

Next, let’s briefly introduce how to escape the percent sign in HTML.

1. Escape characters in HTML

In HTML, you can use some escape characters to represent special characters. These escape characters all start with "&" , and ends with ";", for example, "1f43251d6cef5e3105a5cf955d9aca7f" means greater than sign (>), etc. Among them, "&" is also a special escape character used to represent the "&" character.

2. Escape of the percent sign

In HTML, the escape character used to represent the percent sign (%) is "%", which represents Is the character entity of the percent sign. In this way, when you need to use the percent sign in HTML, you only need to replace the percent sign with "%".

The following is a simple example:

<p> 50&percnt; 的用户喜欢这篇文章 </p>

In the above code, we use "%" to represent the percent sign. In this way, when displayed in the browser, "%" will be parsed as a percent sign and displayed correctly.

It should be noted that when using the percent sign in the URL, you need to follow the encoding rules of the URL, that is, convert the characters that need to be escaped into their corresponding ASCII codes, and add "%" in front of them. For example, when escaping a space character (" ") into " ", you need to convert the space character into its ASCII code: 32, which is represented by " ".

The following example shows how to use escaped characters in HTML and escaped percent signs in URLs:

<p>URL: https://www.example.com/search?q=%20Code%26Design&lang=en-US</p>

In the above example, we used two Two escaped percent signs, one representing the space character and one representing the "&" character. In this way, when the browser parses the URL, it will correctly parse these special characters into their original meanings.

To sum up, the percent sign is a character in HTML that needs to be escaped. It can be escaped using "%". When you need to use a percent sign in the URL, you need to follow the URL encoding rules and use "%xx" to represent the characters that need to be escaped. When writing HTML code, pay attention to the processing of special characters, which can effectively avoid problems caused by characters.

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