Used to insert a new rule into the media block.
rule - The parsable text representing 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 - The index within the media block's rule collection
of the rule before which to insert the specified rule. If the
specified index is equal to the length of the media blocks's
rule collection, the rule will be added to the end of the media
block.
Returns The index within the media block's rule collection of
the newly inserted rule.
\exception DOMException
HIERARCHY_REQUEST_ERR: Raised if the rule cannot be inserted at
the specified index. e.g. if an \@import rule is
inserted after a standard rule set or other at-rule.
INDEX_SIZE_ERR: Raised if the specified index is not a valid
insertion point.
NO_MODIFICATION_ALLOWED_ERR: Raised if this media rule is
readonly.
\exception CSSException
SYNTAX_ERR: Raised if the specified rule has a syntax error
and is unparsable.
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