Get the screen Height & Width only in CSS and no JavaScript

Get the screen width and height as pixel values using a few lines of CSS :

- Powered by @property and trigonometric functions
- Unitless values so you can easily use them inside any formula
- Updates on screen resize

@property --_h {
	syntax: '';
	inherits: true;
	initial-value: 100vh; 
}

@property --_w {
	syntax: '';
	inherits: true;
	initial-value: 100vw; 
}

:root {
	--h: tan(atan2(var(--_h),1px)); /* screen height */
	--w: tan(atan2(var(--_w),1px)); /* screen width */
	/* The result is an integer without unit */
}