I'm thinking that all the styles in .test1 are applied to the element with this classname.
For the second style ".test1, .test1 .test2"
I think this will only be applied when an element with the classname .test2 is inside and element with a classname of .test1. When this happens then the height style from .test1 will be overridden with the style from .test2.
/*styles for anything in the test id with a class name of test1*/
}
#test .test1 .test2 {
/*styles for anything inside the test id and class test1 with a class of test2 */
}
now ive never seen anyone do this with all classes ive only seen it used with p, a, ul, li, and other html elements. It is an easy way to transfer styles inside of a single id w/o having to write sperate classes or ids for each one.
What you have are two rules. The first rule applies to every element with the class of test1. The second rule applies to every element with the class of test1, as well. In addition, the second rule applies to any element of class test2 which is a descendant (child, child of a child, etc.) element of an element of class test1.
So, you have style declarations for class test1 split among two rules. You also have two height declarations in the second rule... which is strange. It also isn't clear which height declaration will "win", because one of them is flagged as "!important".
Since !important is ignored by IE, the height declarations in the second style is just a hack to get firefox to behave.
Essentially firefox will ignore the second height, and IE will igonore the first height.
Ok... so I guess the essential nugget of information you were after is the "descendant selector" syntax. Note that it selects all descendants, not just child elements, but also their child elements, and so on. You should also understand exactly what a "child" element is, vs. for example an "adjacent sibling" element.
If you only want to select direct child elements, you'd use:
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