Why doesn't the video automatically start playing on the iphone?

Question

css

Hello!
Tell me why on iOS in the browser with such settings the video does not automatically start?

<div class="slider">
  <video class="slider-video" autoplay loop muted>
    	<source type="video/mp4">
  	</video>
</div>

sliderVideo.setAttribute('src', "video.mp4");
sliderVideo.play();

Answer 1

This is how it should be:
Here are the 3 attributes for the video tag:
playsinline muted autoplay