The CSS env() function replaces environment variables into CSS. To be more precise, it is a way to insert user-agent-defined variables into your stylesheet.

.element { bottom: env(safe-area-inset-bottom, 0px); }

The CSS ellipse() function allows you to create ellipses when used with the shape-outside, clip-path, and offset-path properties.

.shape { clip-path: ellipse(60px 40px); }

The CSS exp() function lets you raise the e constant to the power of a given number.

.element { font-size: calc(1rem * exp(1.5)); }