The test verifies CSS.setStyleTexts for view-transition pseudos.
==== Initial opacity ====
1
==== Style sheet text ====
#target {
  width: 100px;
  height: 100px;
  background-color: blue;
  view-transition-name: target;
}

::view-transition-group(root),
::view-transition-group(target) {
  animation-play-state: paused;
}

::view-transition-group(target) {
  opacity: 0.75;
}

==== Modified: expect 0.75 ====
0.75