Add your own CSS classes to tinyMCE

The Rich Text Editor (RTE) in WordPress use a JavaScript-library called tinyMCE. It is a widely used library and can be configured in a lot of ways.

WordPress let developers filter the settings to tinyMCE so that it fits your needs.

function mytheme_tiny_mce_before_init($arr){
 $arr['theme_advanced_blockformats'] = 'h2,p,blockquote';
 $arr['theme_advanced_styles'] = 'Leading=leading';

 return $arr;
add_filter( 'tiny_mce_before_init', 'mytheme_tiny_mce_before_init' );

function mytheme_mce_buttons($arr){
 return array('bold', 'italic', '|', 'bullist', 'numlist', '|', 'formatselect', 'styleselect', '|', 'link', 'unlink' );
add_filter( 'mce_buttons', 'mytheme_mce_buttons' );

These few lines of code changes the buttons in the editor, and also adds a format select and a style select.

From the format select you now can select “Heading 2”, “Blockquote” and “Paragraph”. In the style select you can select “Leading” and your element will get the CSS class leading.


Web Developer @ Oakwood Creative -

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Posted in Intermediate

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