Allow Embed Optimizer to work in Classic block and with Classic Editor

[westonruter]

Embed Optimizer includes this line in the description:

performance/plugins/embed-optimizer/readme.txt

Line 32 in 191e853

Please note that the optimizations are intended to apply to Embed blocks. So if you do not see optimizations applied, make sure that your embeds are not inside a Classic Block.

I recall this was done because only Embed blocks have a FIGURE wrapper which we can use to consistently use with the intersection observer. And it's for the sake of being able to use the plugin with Optimization Detective, so the tag visitor can locate embeds via the FIGURE and child DIV with the expected classes:

performance/plugins/embed-optimizer/class-embed-optimizer-tag-visitor.php

Lines 32 to 62 in 191e853

	/**
	* Determines whether the processor is currently at a figure.wp-block-embed tag.
	*
	* @since 0.3.0
	*
	* @param OD_HTML_Tag_Processor $processor Processor.
	* @return bool Whether at the tag.
	*/
	private function is_embed_figure( OD_HTML_Tag_Processor $processor ): bool {
	return (
	'FIGURE' === $processor->get_tag()
	&&
	true === $processor->has_class( 'wp-block-embed' )
	);
	}
	/**
	* Determines whether the processor is currently at a div.wp-block-embed__wrapper tag (which is a child of figure.wp-block-embed).
	*
	* @since 0.3.0
	*
	* @param OD_HTML_Tag_Processor $processor Processor.
	* @return bool Whether the tag should be measured and stored in URL Metrics.
	*/
	private function is_embed_wrapper( OD_HTML_Tag_Processor $processor ): bool {
	return (
	'DIV' === $processor->get_tag()
	&&
	true === $processor->has_class( 'wp-block-embed__wrapper' )
	);
	}

For sites using embeds in Classic blocks with or without Optimization Detective, I think we could possibly support them by explicitly filtering the embeds to inject the FIGURE > DIV wrappers.

See also: support forum topic