Remove placeholders added by do_shortcodes_in_html_tags().
do_shortcodes_in_html_tags
Search only inside HTML elements for shortcodes and process them.
wp_kses_hair_parse
Builds an attribute list from string containing attributes.
wp_kses_attr_parse
Finds all attributes of an HTML element.
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wp_kses_attr_check
Determines whether an attribute is allowed.
wp_kses_one_attr
Filters one HTML attribute and ensures its value is allowed.