1. There is such a paragraph in the official document, so how do we use it?
2. It means that you will customize a class for the placeholder and go to the style sheet to define the style yourself.
3. To define the style you want.
1. There is such a paragraph in the official document, so how do we use it?
2. It means that you will customize a class for the placeholder and go to the style sheet to define the style yourself.
3. To define the style you want.