Why does my dissappear?

WordPress does remove style tags. While it allows HTML to some degree in post content, it’s not really meant for full range of it. It’s a content, not markup data. You could use tiny_mce_before_init filter to adjust extended_valid_elements for TinyMCE instance. See this answer on SO for some examples.

How to incorporate Documentation into wordpress?

WordPress allows you to add help tabs which appear in your Dashboard and on each admin page. $screen = get_current_screen(); $screen->add_help_tab( array( ‘id’ => $id, //unique id for the tab ‘title’ => $title, //unique visible title for the tab ‘content’ => $content, //actual help text ‘callback’ => $callback //optional function to callback ) ); APIGen … Read more

where is the documentation for add_action() parameters?

those parameters aren’t unique to the_posts, they’re parameters for the add_action() function add_action( $tag, $function_to_add, $priority, $accepted_args ); the 10 is just the default priority and 1 is the default number of accepted arguments. since they’re both default, you don’t really need either. http://codex.wordpress.org/Function_Reference/add_action

Styling readme.html in plugin?

It would be better to include your own CSS file that way you can: Use a relative path to your CSS. Avoid problems getting the path right to the wp-admin directory. Not all people put WordPress in the root directory, so your example above would break for them. Possibly redundancy by reusing the CSS in … Read more