FAQ: CSS Setup and Selectors - Review CSS Selectors

This community-built FAQ covers the “Review CSS Selectors” exercise from the lesson “CSS Setup and Selectors”.

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Can we use publish_time instead of publish-time for a selector in CSS? Is it Mandatory to use publish-time

‘‘Classes can be reusable, while IDs can only be used once.’’
i dont understand this

There may be 30 students in a classroom, but each have a unique id, else how would we know who’s grade it is posted on the exam board. There are no names on the list, only numbers, and only the student knows their own number (besides the examiner).

An ID is very specific, and pertains to just one thing. It can be small or it can be large, but it is most definitely singular. There can be only one.

Classes on the other hand are nebulous and ubiquitous. They are everywhere and can pertain to all manner of objects. That’s why they are re-usable.

Is it possible to create a selector chain with an id included?

e.g. #myid, .class {
color: teal;

also, is there a limit to how many selectors can be included in a chain?

What you have there is not a chain, but a selector list. Each selector is treated independently.

A chain would result in a single selector.

#myid.class {}

That selector will target only the id="myid" class="class" element. It would be rather moot, though, since the id is so unique and specific.

Now if we used a descendant selector,

#myid .class

Then only those child elements of #myid with the class, class would be targeted.

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