Css display: inline prevents html elements from becoming block elements

In css, the function of display: none; is to hide html elements. Otherwise, display: block is usually used ;. However, the display: block; function is to convert the current html element into a block element.

Elements such as <select>/<input>/<span> belong to placeholder elements. That is to say, these elements are written together, but only occupy one row. <Div>/

To hide <span> </span> with display: none, use display: inline ;.