Attribute Delay, Iterations, Fill not working

[grvraj82]

<div class="small"><img src="images/01.jpg" /></div> var smallContent = document.querySelector('.small'); new KeyframeEffect(smallContent, [{ 'opacity': 1 }, { 'opacity': 0 }], { duration: 7, fill: 'forwards', delay:5000, iterations:1 })

In the above keyframe effect, the below mentioned options are not working:

1. Delay
2. Iterations
3. Fill

From html page we can only call either “play()” to start the animation or “cancel” to stop and remove the animation.
How to handle “Pause” and “Finish” animations?

Also, no documentation regarding, how to pass values to “additionalTimelines_” variable of “WorkletAnimation” class.
Need your input.

Tried Browser versions:

1. Google Chrome - 64.0.3282.186
2. IE 11
3. IE Edge