Text blended over background color

I'm trying to style a progress bar which looks like this:

progress

The left part can have different colors (green, orange, etc) and I want the text to change color according to the background underneath. Ideally, it should be black/dark-grey over the light-grey right part (like in the example), same black/dark-grey when the left part is rather light, and white when the left part is rather dark (like the green in the example).

I tried various mix-blend-mode: difference and color combinations, couldn't achieve this. Bare example here I tried also something along filter: grayscale(1) contrast(9);

.container {
  width: 200px;
  height: 20px;
  position: relative;
  background-color: #eee;
  text-align: center;
}

.progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  background-color: #43a047;
}

.text {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  mix-blend-mode: difference;
  color: white;
}

<div class="container">
  <div class="progress"></div>
  <div class="text">Some text here</div>
</div>

Solution 1:

You can create another gradient to color the text without the use of mix-blend mode:

.container {
  width: 200px;
  height: 20px;
  background: linear-gradient(to right, #43a047 50%, #eee 0);
  text-align: center;
}

.text {
  background: linear-gradient(to right, white 50%, black 0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  font-weight: bold;
}

<div class="container">
  <div class="text">Some text here</div>
</div>

And for better flexibility you can use CSS variable to control the progress:

.container {
  width: 200px;
  height: 20px;
  margin:5px;
  background: linear-gradient(to right, #43a047 var(--p,50%), #eee 0);
  text-align: center;
}

.text {
  background: linear-gradient(to right, white var(--p,50%), black 0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  font-weight: bold;
}

<div class="container" style="--p:80%">
  <div class="text">Some text here</div>
</div>

<div class="container" style="--p:20%">
  <div class="text">Some text here</div>
</div>
<div class="container">
  <div class="text">Some text here</div>
</div>

Text blended over background color

Solution 1:

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