Function setFromVariables

Reads the value of a CSS variable and assign it to HTML attributes or object field.

const options = [
 // Set the 'width' attribute to the value of --some-css-variable to all elements with class 'blah'
 { query: `.blah`, variable: `some-css-variable`, attribute: `width` }
 // Set #blah's 'size' attribute to the value of css variable '--size'
 { id: 'blah', variable: 'size', attribute: 'size' }
 // Sets someEL.blah = css variable '--hue'
 { element: someEl, variable: `hue`, field: `blah` }
]

setFromVariables(document.body, ...options);
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The first parameter is the context for which CSS variable values are fetched as well as for resolving query selectors. This can usually be document.body.