The ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), ... ... <看更多>

Difference between id and class: HTML page contains multiple element ... character before the name of the ... ... <看更多>

All code has to be lowercase: This applies to HTML element names, ... Instead of presentational or cryptic names, always use ID and class names that reflect ... ... <看更多>