Baseline Widely available
The insertRule() method of the CSSGroupingRule interface adds a new CSS rule to a list of CSS rules.
insertRule(rule)
insertRule(rule, index)
rule
A string
index Optional
An optional index at which to insert the rule; defaults to 0.
The index of the new rule.
ExceptionsIndexSizeError DOMException
Thrown if index is greater than the number of child CSS rules.
HierarchyRequestError DOMException
Thrown if rule cannot be inserted at the specified index due to some CSS constraint.
HierarchyRequestError DOMException
Thrown if the rule is a valid statement but not a nested statement.
let myRules = document.styleSheets[0].cssRules;
myRules[0].insertRule(
"html {background-color: blue;}",
0,
); /* inserts a rule for the HTML element at position 0 */
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