Looking for a feature similar to mix-blend-mode that can change the text color to its inverse when overlapping with a background color that matches

Seeking assistance on a Mondrian-style CSS Grid layout with a rotated sticky heading. Looking to achieve a visual effect where intersecting text turns white when a black horizontal line passes over or under it.

https://i.sstatic.net/YQaxV.png

Considering the use of mix-blend-mode, but unsuccessful so far. Contemplating using a linear-gradient as a background to mimic an image, yet facing challenges with this as well!

Sharing a jsfiddle below for further clarification:

Any advice or guidance would be highly appreciated. Thank you.

Reviewed this related answer Change color of text when scrolling over/under another element?, although it involves different color combinations in the blend mode.

/* CSS code snippet */
/* HTML code snippet */

cssmix-blend-mode

Answer №1

To create the desired effect, you must apply the mix-blend-mode to the parent element and set the text color to white. Note that using colors other than black or white may result in different color outcomes due to blending.

Here is my solution:

.content__heading {
  position: sticky;
  padding: 1.5rem;
  mix-blend-mode: difference;
}

.content__heading h2 {
  position: sticky;
  top: 1.5rem;
  font-size: clamp(4.5rem, 20vmin, 7.875rem);
  line-height: 1;
  -ms-writing-mode: tb-lr;
      writing-mode: vertical-lr;
  transform: rotate(180deg);
  text-align: right;
  /* add color white to achieve the right inversion */
  color: white;
}

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