FAQ: CSS Grid Essentials - Review


This community-built FAQ covers the “Review” exercise from the lesson “CSS Grid Essentials”.

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Are these equivalent? This is instruction 2 in the section 15 of grid css. I tried the first line below and it was not accepted but seems to give the same result as the second line.

grid-template-columns:repeat(2, 25%) 2fr 1fr;
grid-template-columns:25% 25% 2fr 1fr;


It is the same but we still need to keep in mind what the instructions ask for. There is no mention of using repeat(), so it is not expected by the SCT.


HTML class is called “box a” but when I was doing the last exercise (Grid essentials review page 15) CSS only accepted .a { } Why didn’t it accept .box a ?


These are co-classes, which means they have two separate rule sets that both apply.

 .a {}

would be one such rule set;

.box {}

would be the other.

That is a descendant selector that matches an anchor element in a .box class element.

.box .a

matches an .a class element in a .box class element.

The only way we can use both selectors in one rule set is by combining them,


with no white space (indicating descendancy). The above selector will match only to an element with both .box and .a classes.