Access CSS variable from javascript

Question

Is there a way to access a css variable from javascript? Here my css variable declaration.

:root {
  --color-font-general: #336699;
}

Answer 1

Just the standard way:

1. Get the computed styles with getComputedStyle
2. Use getPropertyValue to get the value of the desired property

window.getComputedStyle(element).getPropertyValue('--color-font-general');

Example:

var style = window.getComputedStyle(document.body)
console.log( style.getPropertyValue('--bar') ) // #336699
console.log( style.getPropertyValue('--baz') ) // calc(2px*2)

:root { --foo:#336699; --bar:var(--foo); --baz:calc(2px*2); }