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Test Info:

<!DOCTYPE html>
<html>
<style>
@media (update: none) {
.a { display: none }
}
@media (update: slow) {
.b { display: none }
}
@media (update: fast) {
.c { display: none }
}
@media (update: something-new-and-unknown) {
.d { display: none }
}
@media (update) {
.e { display: none }
}
</style>
<span class=a>A</span>
<span class=b>B</span>
<span class=c>C</span>
<span class=d>D</span>
<span class=e>E</span>