What are the HTML specifications?

1. Correct document type;

2. Use lowercase element names, which look refreshing and easy to write;

3. Close each tag that needs to be closed;

4. Close empty HTML elements, such as ;

5. Use lowercase letters for attribute names;

6. Use quotation marks for attribute values;

7. Add the alt attribute to the image;

8. Avoid a line of code that is too long and try to be less than 80 characters;

9. Do not add blank lines for no reason;

10 .It is recommended to use two spaces for indentation, and Tab is not recommended;

11.It is not recommended to omit;

12.Multiple lines in H5 The first character of the comment is indented by two spaces to make it easier to read;

13. Style sheet

(1) Put a space between the curly braces and the selector on the same line;

(2) Use two spaces for indentation;

(3) Add a space between the colon and the attribute;

(4) Use quotation marks only if the attribute value contains spaces;

(5) Put the right curly brace on a new line;

(6) Each line can have up to 80 characters;

14. When loading js and style sheets, type not necessary;

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