Is html xhtml? Detailed explanation of the difference between xhtml and html

For those who are new to html, they often confuse html and xhtml. They always think that xhtml is html, so is xhtml xhtml? Let’s explain the difference between xhtml and html.

1: Is html xhtml?

html is a hypertext markup language that provides document structuring and encoding In addition to semantics, we will often see html users store data to implement related programs, and xhtml is based on html in xml, but the role of xhtml is very similar to HTML, and the rules of document structure are also the same as xml, which is also currently the case. More popular. The emergence of XHTML5 makes data exchange easier. [Recommended reading: htm,html.shtml difference]

2: Detailed explanation of the difference between xhtml and html

1 When using . Impact, but in XHTML, you need to add a

, which means that the

begins and ends with

, and the
tag needs to add a

2. Elements are required to use lowercase letters

In many web pages, many people are accustomed to uppercase or lowercase letters, but in XHTML, for the sake of uniformity, lowercase letters are required. In html, there is no lowercase requirement. .

3. The alt attribute must be added to the image attribute

In xhtml, if we use an image, we must add the image alt attribute to the image, because errors will occur during xhtml verification , we can add a blank value to the image attribute, but it must be written. However, there is no such requirement in HTML, and there will be no error whether it is added or not.

4. The XHTML document must contain a root element and must have a closing tag to close it.

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