Bad rendering: go-grip (grip) vs Github preview

[Disonantemus]

As a reimplementation of grip but local (without inet), is almost the same with my test files. But right now is not the same as GitHub markdown preview (GFM):

Bad rendering examples (GFM vs grip/go-grip):

GFM don't need two-spaces at the end of line for lineabreaks:

1st line.
2nd line.

Numbered Start (Lists), should be: 57 & 58

57. foo
58. bar

Smart Typography: in GFM should not be recognized

(c) (C) copyright
(r) (R) registered
(tm) (TM) trademark

HTML Symbol Entities inside linecode

© ©
— —
™ ™

HTML Symbol Entities
Character Entities for HTML, CSS and Javascript

€ ¥ £ $ ¢ & ©
¾ ± ∑ ∫ ≤ ≈ ∠
Æ Ď ⇒ ↓ λ Γ

‡ — ⟨ ⟩ ♠
Œ æ ö
℘ ℑ ℜ ℵ
# Ӓ Ϡ � "

ℋ ∲ ⅆ
⮝ ⌈ ⌋
 
ആ ಫ

Definition List: not supported in GFM but rendered ok in go-grip.

Apple
: Pomaceous fruit of plants of the genus Malus in
the family Rosaceae.

: An American computer company.

Orange
: The fruit of an evergreen tree of the genus Citrus.

First Term
: This is the definition of the first term.

Second Term
: This is one definition of the second term.
: This is another definition of the second term.

Emojis

Camping ⛺ Be back soon.
That is so funny! 😂

Classic markup:
😉 😢 😆 😋 ™️

Math (Inline)

This is an inline $f(x)$ function.
This is a block $$f(x)$$ function.

Math: KaTeX

$\sqrt{3x-1}+(1+x)^2$

Math Block \\[...\\]

$${e}^{i\pi }+1=0$$

Flow Charts (Mermaid)

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;

Loading

Headerless: GFM does not support this, but grip does!

|--|--|--|--|--|--|--|--|
|♜| |♝|♛|♚|♝|♞|♜|
| |♟|♟|♟| |♟|♟|♟|
|♟| |♞| | | | | |
| |♗| | |♟| | | |
| | | | |♙| | | |
| | | | | |♘| | |
|♙|♙|♙|♙| |♙|♙|♙|
|♖|♘|♗|♕|♔| | |♖|

[chrishrb]

Oh I didn't know about this spec. I will implement the missing parts as soon as possible! Thanks for this hint.