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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
// Test whether the scrubber was working for even the animation of infinity duration.
add_task(async function () {
await addTab(URL_ROOT + "doc_infinity_duration.html");
await removeAnimatedElementsExcept([".infinity-delay-iteration-start"]);
const { animationInspector, panel } = await openAnimationInspector();
info("Set initial state");
clickOnCurrentTimeScrubberController(animationInspector, panel, 0);
await waitUntilAnimationsPlayState(animationInspector, "paused");
const initialCurrentTime =
animationInspector.state.animations[0].state.currentTime;
info("Check whether the animation currentTime was increased");
clickOnCurrentTimeScrubberController(animationInspector, panel, 1);
await waitUntil(
() =>
initialCurrentTime <
animationInspector.state.animations[0].state.currentTime
);
ok(true, "currentTime should be increased");
info("Check whether the progress bar was moved");
const areaEl = panel.querySelector(".keyframes-progress-bar-area");
const barEl = areaEl.querySelector(".keyframes-progress-bar");
const controllerBounds = areaEl.getBoundingClientRect();
const barBounds = barEl.getBoundingClientRect();
const barX = barBounds.x + barBounds.width / 2 - controllerBounds.x;
const expectedBarX = controllerBounds.width * 0.5;
Assert.less(
Math.abs(barX - expectedBarX),
1,
"Progress bar should indicate at progress of 0.5"
);
});