Top Drawer
A mega menu whose panels are your own canvas frames. Rest on an item or press it and its panel opens under the bar; the item whose panel links to the page being shown lights by itself; and below a width you set, the bar folds into an accordion with each panel opening in place. Draw any layout you like: it is a frame on your canvas, not a form of fields.
Rest on an item.
This block stands in for the page under a site’s menu. Each panel opens over it, hanging from the bar, and closes once the pointer has left both the item and its panel.
A mega menu over a page. Rest on Navigation, Layout or Charts and its panel opens under the bar: each panel is a frame drawn on the canvas, columns, picture and all. Navigation is lit because its panel links to this page. Cross a neighbour on the way down into an open panel and it holds; press an item, or use ArrowDown, Escape and Tab.
The same menu at 390 px, on dark. Below the width set on it, it folds into a menu button: press Menu, then Navigation, and its panel opens in place at the menu’s full width.