tips for understanding the contents of the upcoming css class

I am working with a CSS class that looks like this:

 #menuAccordion h2 a,.dir-rtl #menuAccordion .viewList{
     padding-right:2.5%;
     padding-left:0
 }

Is it correct to assume that for any HTML elements using the menuAccordion class, if there is an <H2> or <A> tag within that element, the specified padding will be applied? What do the .dir-rtl and .viewList refer to?

Also, if I had the following CSS code written on one line:

 #secNav #showHideMenu a.fixed{
     position:fixed;
     top:0
 }

 .HomePage #content{
     min-height:300px
 } 

 #content{
     background-color:#FFF;
     min-height:600px;
     position:relative;
     z-index:0
 }

Can I assume that each time there is a #, it indicates the start of a new class? Can I also assume that these classes are not related to each other? I am trying to understand why the author would consolidate all this code into one line. It's not very readable. Maybe there is a reason behind it.

Thank you.

Answer №1

Let's start with some terminology. The portion preceding a set of curly braces is known as a selector. It is possible to have multiple selectors separated by commas. Within a selector, you can utilize #name to target elements based on their id attribute and .name to target them based on their class attribute.


In CSS, selectors typically match the last item listed.

#menuAccordion h2 a

This selector matches <a> elements within <h2> elements inside an element with id="menuAccordion".

.dir-rtl #menuAccordion .viewList

This selector targets an element with class="viewList" inside an element with id="menuAccordion" within an element with class="dir-rtl".

The significance of the classes viewList and dir-rtl is determined by the page author. They do not carry any inherent meaning.


Condensing everything onto a single line does not alter the essence of the CSS. It is likely done as a space-saving measure, even though it may impact readability.

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