simple css grid not working on IE11 - css

Question

I'm experimenting with css grid and i'm trying to make a simple example, but it does not seem to work on IE11 although i use the appropriate syntax:
.grid {
background: gold;
height: 90vh;
display: -ms-grid;
display: grid;
grid-gap: 20px;
-ms-grid-columns: 405px 1fr;
grid-template-columns: 405px 1fr;
grid-template-rows: 1fr;
-ms-grid-rows: 1fr;
}
section {
background: red;
}
<div class="grid">
<section>
section1
</section>
<section>
section2
</section>
</div>

Answer 1

Apparently you need to explicitly set the location of each element of the grid, so for the example in the question, you'll need to do this:
<div class="grid">
<section class="s1">
section1
</section>
<section class="s2">
section2
</section>
</div>
.s1 {
padding: 20px;
background: red;
-ms-grid-row: 1;
-ms-grid-column: 1;
}
.s2 {
padding: 20px;
background: green;
-ms-grid-row: 1;
-ms-grid-column: 2;
}
Doing it manually can be very tedious, but if you use grid-template-areas, autoprefixer will automatically render it for you.
So the final example looks like this:
.grid {
grid-template-areas: "s1 s2";
background: gold;
height: 500px;
display: -ms-grid;
display: grid;
grid-gap: 20px;
-ms-grid-columns: 405px 1fr;
grid-template-columns: 405px 1fr;
grid-template-rows: 1fr;
-ms-grid-rows: 1fr;
}
.grid .grid{
height: 300px;
}
.s1 {
padding: 20px;
background: red;
-ms-grid-row: 1;
-ms-grid-column: 1;
grid-area: s1;
}
.s1 .s1 {
background: teal;
}
.s2 {
padding: 20px;
background: green;
-ms-grid-row: 1;
-ms-grid-column: 2;
grid-area: s2;
}
.s2 .s2 {
background: yellow;
}
section section {
background: green;
}
<div class="grid">
<section class="s1">
section1
</section>
<section class="s2">
<div class="grid">
<section class="s1">
nested-section1
</section>
<section class="s2">
nested-section2
</section>
</div>
</section>
</div>