Idea of HTML Filetype Icon
There is a vertically aligned rectangle. The left and right sides are longer than the top/bottom sides. In the top right corner there is a small right triangle built into the rectangle, creating a diagonal line in place of part of the top and right sides. In the middle of the rectangle are the letters 'HTML'
This HTML Filetype icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.