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SVG can contain JavaScript. JavaScript can be used to hijack cookies or do other questionable actions. It can even be "hidden" in namespaces: <html xmlns:ø="http://www.w3.org/1999/xhtml"> <ø:script src="//0x.lv/" /> </html> source It is very hard to filter that out during the upload, so it is just not allowed by default.


In order to show new image dimension options in the WordPress admin media library you would need to use the image_size_names_choose filter to assign them a name. So the code in your functions.php should look something like this: if ( function_exists( 'add_image_size' ) ) { add_image_size( 'single-post-medium', 515 ); add_image_size( ...


To load admin scripts only on your pages, you should use the $hook-parameter: function enqueue_scripts( $hook ) { if( 'my-page' != $hook ) return; wp_enqueue_script('jquery'); wp_enqueue_media(); // etc... } add_action('admin_enqueue_scripts', 'enqueue_scripts'); Concerning the loading problem. This seems to be still an open problem. The ...


If this is still a problem, then you can find my answer on wordpress.org's support forum, it might help: wordpress.org/support/topic/resize-failure-on-some-images-with-odd-message This is a part of a code from the jQuery library, to be specific this part is responsible for handling callbacks. It is displayed, because the reponse from wordpres is ...

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