Attribute Selectors (with empty strings) with a match

Orange - Selector matches nothing

Green - Selector matches

Substring matching attribute selectors CSS3

p.test55[class^=""]

p.test65[class$=""]

p.test73[class*=""]

p.test75-x[class*="-"] class="test75-x"

p.test76[class*=""] class="test76 x-y-z"

p.test77[class*=" "] class="test77 x-y-z"

p.test78[class*="-"] class="test78 x-y-z"

Other test with Wildcard Attribute Selectors

References and other links

  1. 6.3.1. Attribute presence and values selectors
  2. 6.3.2. Substring matching attribute selectors
  3. CSS3 Selectors Test Suite Index

Selectors - CSS Class Test