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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML
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CSS
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JS 

              
                #ES5-6のコメントは// CfSはこれ

#class クラス名:冒頭は大文字
class Start
	#コンストラクタは必須
	#引数がなかえればconstructor:()->でOK
	#コンストラクタは必ず->を使う
	#=>はだめ(@=thisの挙動が異なってしまうため)
	constructor: (a,b) ->
		#メンバ変数
		#@はES5-6のthis.と同じ意味
		@naka = a
		@nishi = b
		#単にコンストラクタのブロック内のローカル変数
		#コンストラクタ外では使用できない
		_local = 3
		#自身のメソッドを実行
		#クラスメソッドを実行する場合には、()が必要
		#メソッドの実行は常に()が必要だから
		@callStart()
		#コンストラクタ内で宣言したローカル変数は使える
		console.log "local"+ _local
	
	#以下メソッド
	callStart: =>
		console.log "start: " + @naka + @nishi
		
		#コンストラクタで宣言した_localはコンストラクタの外では使えないのでリファレンスエラーになる
		#console.log "local: " + _local
		
	log: =>
		console.log @naka + @nishi

#単にオブジェクトを作る
new Start "a","b"

#作ったものを代入
#変数の宣言時にvar等は宣言してはダメ
start = new Start "b","c"
#メソッドを実行
start.log();
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