There are two problems, the novice please
1. Figure 1 part I circle, in the head part, and how to appear in the web page?
2. Why is my annotation symbols do not work?

CodePudding user response:

The comments in the HTML symbol is & lt; ! -- -- & gt;

CodePudding user response:

When inside the head tag label or text can be shown, you will automatically move after can display part and the content of the body tag,
Or when the head tags inside a but content can be shown, the head tag will be displayed in the content of the automatic closing before, after the content is in the body tag,

CodePudding user response:

For this document, each label can be seen as a node, you write a comment is invalid, the browser automatically identify it into a text node

CodePudding user response:

refer to the second floor sky waves reply:

when inside the head tag label or text can be shown, you will automatically move after can display part and the content of the body tag,
Or when the head tags inside a but content can be shown, the head tag will be displayed in the content of the automatic closing before, after the content is in the body tag,

Yeah yeah I know, thank you!!!

CodePudding user response:

references to 3 floor with XuGu ah response:

for this document, each label can be seen as a node, you write a comment is invalid, the browser automatically identify it into a text node

Well well, thank you, the problem has been solved