Section

A full-width band that holds other blocks — the outermost layer of most pages, with backgrounds, shape dividers and effects.

The block renders through the section element — the same PHP that runs in the page builder, so the front end is identical either way.

What the sidebar exposes

Option	What it does
variant	Section design variant
is_fullwidth	Run edge to edge
container_width	Inner content width
min_height	Minimum height
column_halign	Horizontal alignment of the columns
column_valign	Vertical alignment of the columns
reverse_columns	Reverse the column order
background	The full background stack
background_pattern	An overlaid pattern
bg_effect	A background effect
divider_top	Shape divider at the top
divider_bottom	Shape divider at the bottom
text_align	Text alignment
padding_top	Space above
padding_bottom	Space below
gap	Space between columns
gap_x	Horizontal gap
gap_y	Vertical gap

Anything not listed stays available in the page builder, and round-trips untouched.

A container previews as an outline, not as itself

Every other Unyson+ block previews with a server-rendered picture of the finished element. A container cannot: its purpose is to hold other blocks, and those have to stay editable in place.

So the canvas shows a neutral dashed outline with the real, editable children inside — not the element's background, padding, width or design preset. Those are applied by PHP on the front end.

That is deliberate. Approximating the wrapper's styling in JavaScript would be a second implementation of the element's CSS, guaranteed to disagree with the first the moment either changes. An outline that is honestly neutral beats a preview that is subtly wrong. Preview the page to see the real thing.

The children reach PHP the same way the page builder's do

save() stores the children's markup in post content, the render callback receives it as $content, and the element renders it inside its wrapper with do_shortcode() — exactly as it does for a container built in the page builder.

note

background is five layers in one option

It is a background-pro value: colour, gradient, image, video and overlay, stacked. A layer is on when it has a value — there is no enable switch.