gecko-dev/layout/html/tests/css/content.css

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GOOD:after  { content: inherit; } 
GOOD:before { content: "Border Collie"; } 
GOOD:after  { content: "Border 'Collie'"; } 
GOOD:before { content: "Border \"Collie\""; } 
GOOD:after  { content: 'Border "Collie"'; } 
GOOD:before { content: 'Border \'Collie\''; } 
GOOD:before { content: "Border\A Collie" }
GOOD:after  { content: A[TITLE="splitting the str\
ing in the middle"] {/*...*/}"; } 
GOOD:before { content: A[TITLE="The Vatican Rag"]; } 
GOOD:after  { content: url("http://www.rotten.com/today/"); } 
GOOD:after  { content: url("beautiful-music.wav") }
GOOD:before { content: counter(x, none); } 
GOOD:after  { content: counter(y, 10); } 
GOOD:before { content: counter(number, upper-roman)}
GOOD:after  { content: attr(enigma) }
GOOD:before { content: open-quote }
GOOD:after  { content: close-quote }
GOOD:before { content: no-open-quote }
GOOD:after  { content: no-close-quote }
GOOD:before { content: open-quote "Border\A Collie" close-quote } 
GOOD:before { content: "a string of text" open-quote url("http://www.rotten.com/today/") no-open-quote counter(number, upper-roman) no-close-quote attr(enigma) close-quote } 
BAD:after  { content: this is a string; }
BAD:before { content: "this is a "string""; } 
BAD:after  { content: "this is a "string'"; } 
BAD:before { content: 'this is a "string""; } 
BAD:after  { content: quote }
BAD:before { content: url(beautiful-music.wav) }
BAD:after  { content: counter(y, 10) inherit }
BAD:before { content: open-quote "some kinda string' close-quote }