Protect schema.org markup in HTML editor Plugin

WordPress HTML editor (tinyMCE) treats schema.org attributes like itemscope/itemtype/itemprop as invalid HTML attributes and strips them when you save the post or page content. This plugin alters this behavior and prevent the WordPress HTML editor from removing the schema.org/microdata markup.

Credits

@azaozz suggested the solution. See the issue discussion here: https://core.trac.wordpress.org/ticket/27931

Just install the plugin as usually and activate it. Once activated, it will keep your markup from being removed by the HTML editor. No setup required.

0.6

• The new feature is the compatibility schema.org attributes for the wp_kses_post function. This is useful when page content from additional fields with HTML editor is filtered using wp_kses_post function by third-party plugins.

0.5

• Added support for the “content” attribute for the “time” tag
• Fixed error “Notice: Undefined index: extended_valid_elements”

0.4

Fixed src attribute being removed from img tag.

0.3

Fixed schema.org attributes being removed from article and p tags.

0.2

Fixed schema.org attributes being removed from img tags.

0.1

Initial version