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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
// Test adjusting the created time with different playback rate of animation.
add_task(async function () {
await addTab(URL_ROOT + "doc_custom_playback_rate.html");
const { animationInspector, inspector, panel } =
await openAnimationInspector();
info(
"Pause the all animation and set current time to middle in order to check " +
"the adjusting time"
);
clickOnPauseResumeButton(animationInspector, panel);
await waitUntilAnimationsPlayState(animationInspector, "paused");
clickOnCurrentTimeScrubberController(animationInspector, panel, 0.5);
info("Check the created times of all animation are same");
checkAdjustingTheTime(
animationInspector.state.animations[0].state,
animationInspector.state.animations[1].state
);
info("Change the playback rate to x10 after selecting '.div2'");
await selectNode(".div2", inspector);
await waitUntil(() => panel.querySelectorAll(".animation-item").length === 1);
await changePlaybackRateSelector(animationInspector, panel, 10);
info("Check each adjusted result of animations after selecting 'body' again");
await selectNode("body", inspector);
await waitUntil(() => panel.querySelectorAll(".animation-item").length === 2);
checkAdjustingTheTime(
animationInspector.state.animations[0].state,
animationInspector.state.animations[1].state
);
await waitUntil(
() => animationInspector.state.animations[0].state.currentTime === 50000
);
ok(true, "The current time of '.div1' animation is 50%");
await waitUntil(
() => animationInspector.state.animations[1].state.currentTime === 50000
);
ok(true, "The current time of '.div2' animation is 50%");
});