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This article mainly introduces the important differences between HTML and XHTML what the relevant knowledge, the content is detailed and easy to understand, simple and fast operation, has a certain reference value, I believe you read this important difference between HTML and XHTML which articles will have a harvest, let's take a look at it.

(1): in XHTML, all tag names and attribute names must be lowercase.

For example, HTML can write: DIV tag

However, XHTML can only write this: DIV tag

(2): tags in XHTML must be nested strictly in accordance with the rules.

For example: HTML can write like this: text

However, XHTML can only write like this: text

(3): the marks of XHTML (including empty marks) must be closed.

For example, HTML can write: "

Words ";" words

"

However, XHTML can only write: "

Words

";" words "

(4): attribute values in XHTML must be enclosed in double quotation marks.

For example: HTML can write like this: text

However, XHTML can only write like this:

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