:not伪类选择器选出与条件不同的元素。 如 span:not ( .sr-only ) { font-weight: normal ; } 将会选出所有不是sr-only类的span元素。 The :not() pseudo-selector is used to target all elements that do not match the selector - in this case, any of your span elements that do not have the span[class~="sr-only"] class. This ensures that your earlier rules for the sr-only class are not overwritten.
Just want to spend this life happier.