Keyword Analysis & Research: must be a valid css selector

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
must be a valid css selector	1.2	0.4	4953	53	28
must	0.69	1	1322	77	4
be	1.94	0.3	274	59	2
a	0.94	0.4	6418	16	1
valid	1.68	0.4	7607	39	5
css	1.65	0.9	9341	54	3
selector	0.71	1	3883	73	8

Keyword	CPC	PCC	Volume	Score
must be a valid css selector	0.28	0.6	2271	47
css has class selector	0.12	0.5	999	70
how to identify a css selector	0.77	0.8	1533	70
css selector not has class	0.12	0.8	5963	39
how to use css selector	0.86	0.8	9715	72
how to test css selector	0.88	0.9	6311	51
css selector has child with class	0.46	0.5	9637	64
css selector not working	0.27	1	3125	57
is selector in css	1.18	0.4	4085	28
explain about css selectors	0.19	0.7	839	100