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Showing content from https://webplatform.github.io/docs/css/cssom/styleSheet/insertRule below:

insertRule · WebPlatform Docs

insertRule Summary

Adds a new CSS rule to the stylesheet.

Method of css/cssom/styleSheet css/cssom/styleSheet

Syntax

var index = stylesheet.insertRule(ruleText, index);

Parameters ruleText

Data-type: String

The at-identifier ("@rule_name") and the rule content.

index

Data-type: Number

The index within the style sheet’s rule list of the rule before which to insert the specified rule. If the specified index equals the length of the style sheet’s rule list, the rule will be added to the end of the style sheet.

Return Value

Returns an object of type NumberNumber

The newly inserted rule’s index within the style sheet’s rule list.

Notes

After the new rule has been inserted, it becomes part of the cascade.

Related specifications

DOM Level 2 Style: Recommendation