Allow all attributes in $allowedposttags tags

I’m pretty sure you have to explicitly name all allowed attributes – just use:

$allowedposttags['iframe'] = array (
    'align'       => true,
    'frameborder' => true,
    'height'      => true,
    'width'       => true,
    'sandbox'     => true,
    'seamless'    => true,
    'scrolling'   => true,
    'srcdoc'      => true,
    'src'         => true,
    'class'       => true,
    'id'          => true,
    'style'       => true,
    'border'      => true,
);

If you can think of others let me know!