I've watched and read many CSS tutorials but haven't heard of these things before. Are there any particular resources that helped you grasp these concepts?
Yes, but it's not easy reading. I read and kept re-reading the CSS 2.1 specification until the concepts gradually sunk in. I combined that with time spent using jsfiddle or jsbin trying experiments to see what happened, and when the behaviour wasn't what I expected, searching the spec for an explanation. When you initially read it, the language it uses is quite daunting, but with re-readings it slowly comes to you, and it becomes clear just how much information is packed in there.
In particular, I recommend reading sections 2 through 7 of the CSS 2.2 spec which provide the grounding for CSS, yet are regularly skipped because they don't contain the description of any CSS properties.
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I've watched and read many CSS tutorials but haven't heard of these things before. Are there any particular resources that helped you grasp these concepts?
Yes, but it's not easy reading. I read and kept re-reading the CSS 2.1 specification until the concepts gradually sunk in. I combined that with time spent using jsfiddle or jsbin trying experiments to see what happened, and when the behaviour wasn't what I expected, searching the spec for an explanation. When you initially read it, the language it uses is quite daunting, but with re-readings it slowly comes to you, and it becomes clear just how much information is packed in there.
In particular, I recommend reading sections 2 through 7 of the CSS 2.2 spec which provide the grounding for CSS, yet are regularly skipped because they don't contain the description of any CSS properties.