See some HTML, class class with a minus sign (-), the condition of the CSS class name is not unable to begin with (-)? Such as the primary in the following code

'& lt; Ul & gt; '

Please comment, any special meaning? Thank you very much!

CodePudding user response:

Cannot begin with (-), but not the beginning position can be (-)

CodePudding user response:

And part of the browser is to begin with (-),