* alpha - boolean, whether to draw alpha in bgimg. Default true.
* bgcolor - color, sets button tint.
* bgcolor_hovered - color when hovered. Defaults to a lighter bgcolor when not provided.
+ * This is deprecated, use states instead.
* bgcolor_pressed - color when pressed. Defaults to a darker bgcolor when not provided.
+ * This is deprecated, use states instead.
* bgimg - standard background image. Defaults to none.
* bgimg_hovered - background image when hovered. Defaults to bgimg when not provided.
+ * This is deprecated, use states instead.
* bgimg_middle - Makes the bgimg textures render in 9-sliced mode and defines the middle rect.
See background9[] documentation for more details. This property also pads the
button's content when set.
* bgimg_pressed - background image when pressed. Defaults to bgimg when not provided.
+ * This is deprecated, use states instead.
* border - boolean, draw border. Set to false to hide the bevelled button pane. Default true.
* content_offset - 2d vector, shifts the position of the button's content without resizing it.
* noclip - boolean, set to true to allow the element to exceed formspec bounds.
* image_button (additional properties)
* fgimg - standard image. Defaults to none.
* fgimg_hovered - image when hovered. Defaults to fgimg when not provided.
+ * This is deprecated, use states instead.
* fgimg_pressed - image when pressed. Defaults to fgimg when not provided.
+ * This is deprecated, use states instead.
* NOTE: The parameters of any given image_button will take precedence over fgimg/fgimg_pressed
* tabheader
* noclip - boolean, set to true to allow the element to exceed formspec bounds.