在MarkDown語法中，使用代碼塊的方法是使用 ```來包裹住代碼部分。
如果代碼內部也有這種符號肯能會造成無法正常顯示的情況，這時只要將內部的代碼使用Tab鍵縮進兩次即可正常顯示。
在Haroopad中，如果只輸入```則會始終顯示黑色字體而不會有高亮標記，並不像某些編輯器那樣會自動識別或是有默認配色，這時需要在 後面加上語言名字或者縮寫（key）即可，比如：
```SQL
INSERT INTO …
` ````
這樣來寫，那麼Haroopad支持了那些語言和寫法呢？以下是官網摘取的列表：
| Language | key |
|---|---|
| 1C | 1c |
| ActionScript | actionscript |
| Apache | apache |
| AppleScript | applescript |
| AsciiDoc | asciidoc |
| AspectJ | asciidoc |
| AutoHotkey | autohotkey |
| AVR Assembler | avrasm |
| Axapta | axapta |
| Bash | bash |
| BrainFuck | brainfuck |
| Cap’n Proto | capnproto |
| Clojure REPL | clojure |
| Clojure | clojure |
| CMake | cmake |
| CoffeeScript | coffeescript |
| C++ | cpp |
| C# | cs |
| CSS | css |
| D | d |
| Dart | d |
| Delphi | delphi |
| Diff | diff |
| Django | django |
| DOS .bat | dos |
| Dust | dust |
| Elixir | elixir |
| ERB (Embedded Ruby) | erb |
| Erlang REPL erlang- | repl |
| Erlang | erlang |
| FIX | fix |
| F# | fsharp |
| G-code (ISO 6983) | gcode |
| Gherkin | gherkin |
| GLSL | glsl |
| Go | go |
| Gradle | gradle |
| Groovy | groovy |
| Haml | haml |
| Handlebars | handlebars |
| Haskell | haskell |
| Haxe | haxe |
| HTTP | http |
| Ini file | ini |
| Java | java |
| JavaScript | javascript |
| JSON | json |
| Lasso | lasso |
| Less | less |
| Lisp | lisp |
| LiveCode | livecodeserver |
| LiveScript | livescript |
| Lua | lua |
| Makefile | makefile |
| Markdown | markdown |
| Mathematica | mathematica |
| Matlab | matlab |
| MEL (Maya Embedded Language) | mel |
| Mercury | mercury |
| Mizar | mizar |
| Monkey | monkey |
| nginx | nginx |
| Nimrod | nimrod |
| Nix | nix |
| NSIS | nsis |
| Objective C | objectivec |
| OCaml | ocaml |
| Oxygene | oxygene |
| Parser 3 | parser3 |
| Perl | perl |
| PHP | php |
| PowerShell | powershell |
| Processing | processing |
| Python’s profiler output | profile |
| Protocol Buffers | protobuf |
| Puppet | puppet |
| Python | python |
| Q | q |
| R | r |
| RenderMan RIB | rib |
| Roboconf | roboconf |
| RenderMan RSL | rsl |
| Ruby | ruby |
| Oracle Rules Language | ruleslanguage |
| Rust | rust |
| Scala | scala |
| Scheme | scheme |
| Scilab | scilab |
| SCSS | scss |
| Smali | smali |
| SmallTalk | smalltalk |
| SML | sml |
| SQL | sql |
| Stata | stata |
| STEP Part 21 (ISO 10303-21) | step21 |
| Stylus | stylus |
| Swift | swift |
| Tcl | tcl |
| TeX | tex |
| Thrift | thrift |
| Twig | twig |
| TypeScript | typescript |
| Vala | vala |
| VB.NET | vbnet |
| VBScript in HTML vbscript- | html |
| VBScript | vbscript |
| Verilog | verilog |
| VHDL | vhdl |
| Vim Script | vim |
| Intel x86 Assembly | x86asm |
| XL | xl |
| XML, HTML | xml |
參考網站：
- http://pad.haroopress.com/page.html?f=how-to-write-fenced-code-block（儘管可能顯示韓文，不要在意，下拉到language一欄即可看到）
- http://pad.haroopress.com/page.html（Haroopad文檔）