STR: - open the following URL in a new tab data:text/html,<style>body{--foo:25px;margin:var(--foo);} - open the inspector - move your mouse over the margin value in the rule-view ==> the tooltip shows --foo = 25px which is correct - now click on the value of --foo, on the line above, and change it to something else - now display the tooltip again Actual: it still displays the same --foo = 25px Expected: it should display the new, updated, value