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

insertRule · WebPlatform Docs

insertRule Summary

Inserts a new rule to a media block.

Method of css/cssom/CSSMediaRule/CSSMediaRule css/cssom/CSSMediaRule/CSSMediaRule

Syntax

var ruleIndex = mediaRule.insertRule();

Parameters ruleText

Data-type: String

The parsable text that represents the rule. For rule sets, this contains both the selector and the style declaration. For at-rules, this specifies both the at-identifier and the rule content.

index

Data-type: Number

The index within the media block’s rule collection. The rule is inserted immediately before this index. If the specified index is equal to the length of the media block’s rule collection, the rule is added to the end of the media block.

Return Value

Returns an object of type NumberNumber

The index of the newly inserted rule within the media block’s rule collection.

Standards information

Document Object Model (DOM) Level 2 Style Specification,

Related specifications

DOM Level 2 Style: Recommendation