JavaScript Learning Note 20160121-css Selector

Elements can be described by ID, tag name, or class:

More generally, elements can be selected based on attributes:

These basic selectors can be used in combination:

Selectors can specify the document structure ( important, the use of > has not been understood before ):

Selectors can be combined to select several or more groups of elements:

Implementation differences between Queryselector and Queryselectorall in each browser

CSS defines pseudo-elements such as ": First-line" and "First-letter". In CSS, they match part of a text node rather than the actual element. If they are used together with Queryselectorall () and Queryselector (), they do not match.

Queryselectorall () is equivalent to the $ () method in jquery.

JavaScript Learning Note 20160121-css Selector