HTML specification and html encoding Specification

HTML specification and html encoding Specification

1. The document type is correct;

2. Use a lower-case element name, which looks fresh and easy to write;

3. Close each tag to be closed;

4. disable empty HTML elements, such as <meta/>;

5. the attribute name must be in lower case;

6. attribute values are enclosed in quotation marks;

7. Add the alt attribute to the image;

8. Avoid a line of code that is too long and should contain at least 80 characters;

9. Do not add blank lines for no reason;

10. Two spaces are recommended for indentation, but Tab is not recommended;

11.

12. The first character of multi-line comments is indented with two spaces, making it easier to read;

13. Style Sheet

(1) The curly braces are in the same line as the selector, and a space is added between them;

(2) Use two spaces to indent;

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

(4) quotation marks are used only when the attribute value contains spaces;

(5) place the right curly braces in a new row;

(6) each line can contain a maximum of 80 characters;

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