left: initial doesn't work in internet explorer

Question

In IE, the tooltip is not shown like I want.

That's the correct display (chrome):

That's the wrong display (IE)

And that's my css:

.tooltipfullscreen:hover:after {
    left: initial;
    right: 0;
    transform: none;
}

Answer 1

IE doesn't support the initial keyword, and support for it was only just added to Microsoft Edge.

There really isn't much of a point using initial with properties like left — it's pretty well-known that the initial value of those properties is auto so just hardcode that in.