What's the difference between CSS classes .foo.bar (without space) and .foo .bar (with space)
46872
What does a space mean in a CSS selector? i.e. What is the difference between .classA.classB and .classA .classB?
76947
css3 nth of type restricted to class
93932
\bar vs. \overline - when to use what, semantically?
113270
What does a[href^="..."] do in CSS?
71383
What does the double colon (::) mean in CSS?
135723
Why does changing a CSS class name break the styles?
64769
What is the difference between \empty and \@empty?
26804
What is the difference between HTML tags  and ?
21063
What is the difference between \def and \newcommand?
91204
What is this CSS selector? [class*="span"]
3229
What's the difference between HTML's and CSS's width attribute?
13890
Why do browsers match CSS selectors from right to left?
137096
What is the purpose of the '@' symbol in CSS?
72725
What's the difference between \newcommand and \newcommand*?
55205
CSS attribute selectors: The rules on quotes (", ' or none?)
110482
Explicit space character?
142478
When to use margin vs padding in CSS