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Add comment explaining some of the test.

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dbaron@dbaron.org 2007-04-17 11:57:35 -07:00
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layout/style/test/test_value_storage.html
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@ -21,6 +21,30 @@
/** Test for parsing, storage, and serialization of CSS values **/
/*
* The idempotence tests here deserve a little bit of explanation. What
* we're testing here are the following operations:
* parse: string -> CSS rule
* serialize: CSS rule -> string (normalization 1)
* (this actually has two variants that go through partly different
* codepaths, which we exercise with getPropertyValue and cssText)
* compute: CSS rule -> computed style
* cserialize: computed style -> string (normalization 2)
*
* Both serialize and cserialize do some normalization, so we can't test
* for pure round-tripping, and we also can't compare their output since
* they could normalize differently. (We might at some point in the
* future want to guarantee that any output of cserialize is
* untouched by going through parse+serialize, though.)
*
* So we test idempotence of parse + serialize by running the whole
* operation twice. Likewise for parse + compute + cserialize.
*
* Slightly more interestingly, we test the idempotence of serialize +
* parse by comparing the output of parse + compute + cserialize to the
* output of parse + serialize + parse + compute + cserialize.
*/
var gShorthandsWithoutCondensingSerialize = {
"-moz-border-radius": true,
"-moz-outline-radius": true,