Why is my position: absolute div placed differently in Edge?

Question

We are trying to have a badge over the corner of a picture. For this we use a parent <div> as wrapper and a <span> inside. It's working fine so far for Chrome, Firefox, and IE11 but in MS Edge it's not working as expected. It seems like Edge calculates the right: property very different from the others.

Result as expected:

Unexpected result:

Here is my code:

.parent {
  width: 200px;
  height: 200px;
  border: 1px solid black;
  position: relative;
  overflow: hidden;
}

.child {
  background-color: #e2001a;
  position: absolute;
  right: -65px;
  width: 220px;
  height: 50px;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  padding-left: 100px;
  display: table;
  z-index: 10;
  color: white;
  text-align: center;
  line-height: 1.2;
}

<div class="parent">
  <span class="child">Some cool text</span>
</div>

Am I doing something wrong, or is the Edge behavior very different from the other browsers?

Answer 1

You can do it differently like below, it seems to be fine on Edge*

.parent {
  width: 200px;
  height: 200px;
  border: 1px solid black;
  position: relative;
  overflow: hidden;
}

.child {
  background-color: #e2001a;
  position: absolute;
  top: 0;
  left: -20px;
  right: -20px;
  height: 50px;
  text-align: center;
  transform: translateX(30%) rotate(45deg) translateY(70%);
  z-index: 10;
  color: white;
  text-align: center;
  line-height: 1.2;
}

<div class="parent">
  <span class="child">Some cool text</span>
</div>

^{* I don't know why...}

Update to work with original code snippet:

transform needs to be changed like above and translateX()and translateY() needed a bit of adjusting to work.

Here's the code that works in Chrome, Firefox, Edge, and IE11:

.parent {
  width: 200px;
  height: 200px;
  border: 1px solid black;
  position: relative;
  overflow: hidden;
}

.child {
  background-color: #e2001a;
  position: absolute;
  right: -65px;
  width: 220px;
  height: 50px;
  transform: translateX(10%) rotate(45deg) translateY(100%); //wokring with translateX and translateY instead of just rotate
  display: table;
  z-index: 10;
  color: white;
  text-align: center;
  line-height: 1.2;
}

<div class="parent">
  <span class="child">Some cool text</span>
</div>