CSS3 - Blending Mode between different HTML Elements

Question

I have an good idea what the answer is going to be, but I just want to make absolutely sure.

I have two elements, div.glass and div.sound, both contain a background-image. Is it possible to set the blending mode to each div so that they interact with each other? For example:

div.glass,
div.sound {
  width: 597px;
  height: 154px;
  position: absolute;
}
div.glass {
  background: url(glass.png) 0 0 no-repeat;
  z-index: 9;
  top: 5px;
  left: 5px;
}
div.sound {
  background: url(soundwave.png) 0 0 no-repeat;
  z-index: 10;
  blend-mode: multiply;
  top: 50px;
  left: 300px;
}
div.container {
  position: relative;
}

<div class="container">
  <div class="glass"></div>
  <div class="sound"></div>
</div>

Answer 1

You have 2 ways to use blend-modes

When doing it in the same element, the property is background-blend-mode.

But, when doing it with 2 elements. it is mix-blend-mode

div.glass,
div.sound {
  width: 597px;
  height: 154px;
  position: absolute;
}
div.glass {
  background: url(http://placekitten.com/1200/900) 0 0 no-repeat;
  z-index: 9;
  top: 5px;
  left: 5px;
}
div.sound {
  background: url(http://placekitten.com/1000/750) 0 0 no-repeat;
  z-index: 10;
  mix-blend-mode: difference;
  top: 50px;
  left: 300px;
}
div.container {
  position: relative;
}

<div class="container">
  <div class="glass"></div>
  <div class="sound"></div>
</div>