Label 
A Label is text within a rectangular boundingbox. The halign and valign attributes always refer to unrotated horizontal and vertical. This is different from text, where alignment is relative to text flow direction.
A Label's size is known, so if tellwidth and tellheight are set to true (the default values) a GridLayout with Auto column or row sizes can shrink to fit. 
using CairoMakie
fig = Figure()
fig[1:2, 1:3] = [Axis(fig) for _ in 1:6]
supertitle = Label(fig[0, :], "Six plots", fontsize = 30)
sideinfo = Label(fig[1:2, 0], "This text is vertical", rotation = pi/2)
fig
Justification and lineheight of a label can be controlled just like with normal text.
using CairoMakie
f = Figure()
Label(f[1, 1],
    "Multiline label\nwith\njustification = :left\nand\nlineheight = 0.9",
    justification = :left,
    lineheight = 0.9
)
Label(f[1, 2],
    "Multiline label\nwith\njustification = :center\nand\nlineheight = 1.1",
    justification = :center,
    lineheight = 1.1,
    color = :dodgerblue,
)
Label(f[1, 3],
    "Multiline label\nwith\njustification = :right\nand\nlineheight = 1.3",
    justification = :right,
    lineheight = 1.3,
    color = :firebrick
)
f
Attributes 
alignmode 
Defaults to Inside()
The align mode of the text in its parent GridLayout.
color 
Defaults to @inherit :textcolor :black
The color of the text.
font 
Defaults to :regular
The font family of the text.
fontsize 
Defaults to @inherit :fontsize 16.0f0
The font size of the text.
halign 
Defaults to :center
The horizontal alignment of the text in its suggested boundingbox
height 
Defaults to Auto()
The height setting of the text.
justification 
Defaults to :center
The justification of the text (:left, :right, :center).
lineheight 
Defaults to 1.0
The lineheight multiplier for the text.
padding 
Defaults to (0.0f0, 0.0f0, 0.0f0, 0.0f0)
The extra space added to the sides of the text boundingbox.
rotation 
Defaults to 0.0
The counterclockwise rotation of the text in radians.
tellheight 
Defaults to true
Controls if the parent layout can adjust to this element's height
tellwidth 
Defaults to true
Controls if the parent layout can adjust to this element's width
text 
Defaults to "Text"
The displayed text string.
valign 
Defaults to :center
The vertical alignment of the text in its suggested boundingbox
visible 
Defaults to true
Controls if the text is visible.
width 
Defaults to Auto()
The width setting of the text.
word_wrap 
Defaults to false
Enable word wrapping to the suggested width of the Label.
