Tests that the parameters to CSSSupportsRule.insertRule() / deleteRule() are mandatory.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS supportsRule.__proto__ is CSSSupportsRule.prototype
PASS supportsRule.insertRule() threw exception TypeError: Not enough arguments.
PASS supportsRule.cssRules.length is 1
PASS supportsRule.insertRule('body { width: 0; }') did not throw exception.
PASS supportsRule.cssRules.length is 2
PASS supportsRule.deleteRule() threw exception TypeError: Not enough arguments.
PASS successfullyParsed is true
TEST COMPLETE
