What is the difference between adding .classA and .classB.classA in CSS?

the problem is when I put .show instead of.box.show in CSS the even boxes don’t come from the left side. I just wanna know why? because I thought they were the same thing. but it seems like in this …

Applying CSS by Component’s displayName?

Calling all experts! I am trying to add a class to disable all element’s descendants to be read only, the style is fine, but it doesn’t applied to all descendants nor any: The element is a component that I want to have the above style by displayName as div id, like so: The output HTML: The final result should show the component has the style cascade to all its children. Is that even possible? Thanks in advance to all of the participants. Answer It seems that I don’t need to use id attribute after all. It is sufficient to define

Select Element By CSS style (all with given style)

Is there a way to select all elements that have a given style using JavaScript? Eg, I want all absolutely positioned elements on a page. I would assume it is easier to find elements by style where …