tag

In some versions of WordPress there is a filter that strips some tags from the html code. If you want to remove this filter just open wp-includes/kses.php and find this row:

function kses_init_filters() {
    // Normal filtering.
    add_filter('pre_comment_content', 'wp_filter_kses');
    add_filter('title_save_pre', 'wp_filter_kses');

    // Post filtering
    add_filter('content_save_pre', 'wp_filter_post_kses');
    add_filter('excerpt_save_pre', 'wp_filter_post_kses');
    add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
}

and comment out the rows that you need:

function kses_init_filters() {
    // Normal filtering.
    add_filter('pre_comment_content', 'wp_filter_kses');
    add_filter('title_save_pre', 'wp_filter_kses');

    // Post filtering
    //add_filter('content_save_pre', 'wp_filter_post_kses');
    add_filter('excerpt_save_pre', 'wp_filter_post_kses');
    //add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
}

Then if you save the post in html it’s OK, but if you switch to normal view and then go back to html view the tags could be stripped again. This hapens most likely from the MCE Editor and to resolve this issue you could install a plugin called TinyMCE Valid Elements or some similar plugin.

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