ansition-type(foo, bar) #positive7 { background: green; }

/* negative checks */
html:active-view-transition-type(fooo) #negative1 { background: red; }
html:active-view-transition-type(foo1, bar2) #negative2 { background: red; }
/* invalid syntax */
html:active-view-transition-type(*) #negative3 { background: red; }
html:active-view-transition(foo) #negative4 { background: red; }
html:active-view-transition-type(foo,) #negative5 { background: red; }
html:active-view-transition-type() #negative6 { background