Same question so i hope you don’t mind using this thread,
I use a crelly slider shortcode. The shortcode in the pageheader content does not make it full width.
I used hooks to place it in ‘after header’ hook, then it is full width.
But adding
.home .site-header {
position: absolute;
width: 100%;
}
to custom css as i read somewhere else will hide the menu behind the slider. You can see it here: http://optiek.sierink-wp.nl