List does not work in IE 11

The list type "a" does not work in IE11. However works well on IE Edge.

Expected Output:

a. Option 1

b. Option 2

c. Option 3

Observed Output:

. Option 1

. Option 2

. Option 3

Example code below:

<ol>

<li type="a"> Option 1 </li>

<li type="a"> Option 2 </li>

<li type="a"> Option 3 </li>

</ol>