Why css "all: unset" works weirdly in Safari browser for MacOS?

Question

So basically I made this situation, the parent has the css all: unset.

Then I notice when I use Safari(Version 12.1.1 (14607.2.6.1.1)) all the children of it color only can be effected by * block, not even inline or !important.

But only color behaves that way, as you can see the background-color is using it's own property.

But it works fine in Chrome, is it a glitch in safari or I did something wrong? And how can I fix it in Safari?

* {
  color: red;                   /* Text color is using this one */
  background-color: pink;
}

.Parent {
  all: unset;
}

.Child {
  color: blue;
  background-color: yellow;     /* Background color is using this one */
}

<div class="Parent">
  <div class="Child">Some Text</div>
</div>

• Expected result(Chrome)

• Wrong result(Safari Version 12.1.1 (14607.2.6.1.1))

Answer 1

Safari uses the special property -webkit-text-fill-color. If you use that, the color works:

* {
  color: red;                   /* Text color is using this one */
  background-color: pink;
  -webkit-text-fill-color: red;
}

.Parent {
  all: unset;
}

.Child {
  color: blue;
  background-color: yellow;     /* Background color is using this one */
  -webkit-text-fill-color: blue;
}

<div class="Parent">
  <div class="Child">Some Text</div>
</div>

@ Dan Fabulich commented the bug for this below:
https://bugs.webkit.org/show_bug.cgi?id=158782