Why does List-style-type always expire in CSS?

The List-style property is generally set to none. Need to add "•" or other symbols preferably directly with the keyboard input or with escape symbols

Ul{list-style:none; margin:0; padding:0} UI li{line-height:npx;} generally 20px;

As long as this setting, there is no problem.

The general CSS is put li{list-style:none;}

When you need to use it, define it separately.

Li{background:url (...);}

(b) To explore why List-style-type is always ineffective?

The key is to apply float:left; attributes, and list-style-position:outside; property is caused by the. The reasons are as follows:

1. Left float will make the box model one by one transverse rehearsal
2. The position of the list symbol is outside the box model
3. So the symbol for the second list item is covered by the first list item

Workaround:

[code= "CSS"] li {   list-style-position:inside;} [/code]