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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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Adding Classes

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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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.

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Babel includes JSX processing.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <h1>クイズアプリを作ってみよう！！！</h1>
<!--クイズのの表示-->
<h2 id="_question">ここに問題が表示されます。</h2>
<!--回答-->
<ul>
<li id="_ans1">回答１</li>
<li id="_ans2">回答２</li>
<li id="_ans3">回答３</li>
</ul>
<button type="button" id="_answer_1" onclick="Answer_Check(1)">回答1</button>
<button type="button" id="_answer_2" onclick="Answer_Check(2)">回答2</button>
<button type="button" id="_answer_3" onclick="Answer_Check(3)">回答3</button>
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CSS
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JS 

              
                // 初期画面起動時
let Question = [
["JavaScriptで「Hello World」を正しく表示されないのはどれ？",
"1. document.write('Hello World');",
"2. document.write(Hello World);",
"3. document.write('Hello World')",
"1"],
["JavaScriptで【document.write(5 + 4);】を実行したらどうなる？",
"1. 5 + 4);",
"2. エラーになる",
"3. 9",
"3"],
["JavaScriptで余りを求めるのは？",
"1. /",
"2. %",
"3. @",
"2"]
];
// 初期変数定義
// 問題を表示するオブジェクトを取得する
let Q = document.getElementById('_question');
// 問題を表示するオブジェクトを取得する
let A1 = document.getElementById('_ans1');
let A2 = document.getElementById('_ans2');
let A3 = document.getElementById('_ans3');
// 正解数を保持する値
let Correct = 0;
// 現在の問題数
let Qcnt = 0;
// 問題を画面に表示する処理
function Q_Set() {
Q.textContent = Question[Qcnt][0];
A1.textContent = Question[Qcnt][1];
A2.textContent = Question[Qcnt][2];
A3.textContent = Question[Qcnt][3];
};
// 問題を画面に表示
Q_Set();
// 回答ボタンを押したときの処理
function Answer_Check(ans) {
if(ans == Question[Qcnt][4]) {
alert("正解");
Correct++;
} else {
alert("不正解");
}
Qcnt++;
if (Qcnt == Question.length) {
Q.textContent = "問題は以上です。正解数は" + Correct + "でした。";
A1.textContent = "";
A2.textContent = "";
A3.textContent = "";
} else {
Q_Set();
}
}
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999px

Console