I am using material2 and Material icons in my project. I want to know how these named icons are rendered in the browser. I have used
This feature is called ligatures which allows to render icons using name.
you can find more details in below link
https://alistapart.com/article/the-era-of-symbol-fonts
http://google.github.io/material-design-icons/#icon-font-for-the-web
As per the material icon's documentation
It’s easy to incorporate icons into your web page.
<i class="material-icons">face</i> // rendered as face
This example uses a typographic feature called ligatures, which allows rendering of an icon glyph simply by using its textual name. The replacement is done automatically by the web browser and provides more readable code than the equivalent numeric character reference
And here is the detailed answer on stackoverflow
How do ligature icons work in Material Icons?