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Showing content from https://webplatform.github.io/docs/css/cssom/methods/addRule below:

addRule · WebPlatform Docs

addRule

Method of css/cssom/methods css/cssom/methods

Syntax

var object = object.addRule(Selector, Style, Index);

Parameters Selector

Data-type: String

String that specifies the selector for the new rule. Single contextual selectors are valid. For example, "div p b" is a valid contextual selector.

Style

Data-type: String

String that specifies the style assignments for this style rule. This style takes the same form as an inline style specification. For example, "color:blue" is a valid style parameter.

Index

Data-type: Number

Integer that specifies the zero-based position in the rules collection where the new style rule should be placed. Default is -1, which specifies that the rule is added to the end of the collection.

Return Value

Returns an object of type

Reserved. Always returns -1.

Examples

This example uses the addRule method to add a rule that sets all bold text appearing in a DIV to the color blue.

<STYLE>
</STYLE>
<DIV>
Internet Explorer makes <B>HTML</B> dynamic.
</DIV>
<SCRIPT>
   var new_rule;
   new_rule = document.styleSheets[0].addRule("DIV B", "color:blue", 0);
</SCRIPT>

Notes Remarks

You can add up to 4095 style rules with the addRule method. After that, the method returns an “Invalid Argument” exception. You can apply rules to a disabled styleSheet, but they do not apply to the document until you enable the styleSheet.