Test page for fonts. Preferably, all vertical bars should line up.

{-
--------------------------|
abcdefghijklmnopqrstuvwxyz|
ABCDEFGHIJKLMNOPQRSTUVWXYZ|
ᵃᵇᶜᵈᵉᶠᵍʰⁱʲᵏˡᵐⁿᵒᵖ ʳˢᵗᵘᵛʷˣʸᶻ|
ᴬᴮ ᴰᴱ ᴳᴴᴵᴶᴷᴸᴹᴺᴼᴾ ᴿ ᵀᵁⱽᵂ   |
ₐ   ₑ  ₕᵢⱼₖₗₘₙₒₚ ᵣₛₜᵤ  ₓ  |
--------------------------|
----------|
0123456789|
⁰¹²³⁴⁵⁶⁷⁸⁹|
₀₁₂₃₄₅₆₇₈₉|
----------|
------------------------|
αβγδεζηθικλμνξοπρστυφχψω|
ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ|
------------------------|
----|
ℕℕℕℕ|
ℤℤℤℤ|
ℂℂℂℂ|
ℍℍℙℙ|
ℚℚℝℝ|
∀∀∃∃|
ƛƛ··|
′′″″|
‴‴‴‴|
††‡‡|
''""|
``~~|
≡≡≢≢|
≃≃≲≲|
≟≟≐≐|
∸∸^^|
⟨⟨⟩⟩|
⌊⌊⌋⌋|
⌈⌈⌉⌉|
→→⇒⇒|
←←⇐⇐|
——↠↠|
∈∈∋∋|
⊢⊢⊣⊣|
∷∷∷∷|
∎∎∎∎|
∅∅∅∅|
⦂⦂⦂⦂|
----|
-}

Here are some characters that are often not monospaced.

{-
----|
😇😇|
😈😈|
⁗⁗| 
----|
------------|
⟶⟶⟶⟶|
⟹⟹⟹⟹|
------------|
----------|
𝔸𝔹𝔻𝔼𝔽𝔾𝕀𝕁𝕂𝕃𝕄ℕ𝕆𝕊|
𝕒𝕓𝕔𝕕𝕖𝕗𝕘𝕙𝕚𝕛|
𝑎𝑏𝑐𝑑𝑒𝑓𝑔𝑖𝑗𝑘|
----------|

-}