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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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About the <head>

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Insecure Resource

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CSS

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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

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HTML 

              
                <table>
  <thead>
    <tr><th>Checkbox
  <tbody>
    <tr>
      <td><input type="checkbox" class="chk" name="ago" value="a1">
    <tr>
      <td><input type="checkbox" class="chk" name="ago" value="a2">
    <tr>
      <td><input type="checkbox" class="chk" name="ago" value="a3">
    <tr>
      <td><input type="checkbox" class="chk" name="ago" value="a4">  
    <tr>
      <td><input type="checkbox" class="chk" name="ago" value="a5">
</table>
        
<button type='button' id='btn1' class="btn-square">map</button>
        
<button type='button' id='btn2' class="btn-square-shadow">each</button>
!

CSS 

              
                table{
  width: 20%;
  border-collapse:separate;
  border-spacing: 0;
  margin:20px 100px;
}

table th:first-child{
  border-radius: 5px 0 0 0;
}

table th:last-child{
  border-radius: 0 5px 0 0;
  border-right: 1px solid #3c6690;
}

table th{
  text-align: center;
  color:white;
  background: linear-gradient(#829ebc,#225588);
  border-left: 1px solid #3c6690;
  border-top: 1px solid #3c6690;
  border-bottom: 1px solid #3c6690;
  box-shadow: 0px 1px 1px rgba(255,255,255,0.3) inset;
  width: 25%;
  padding: 10px 0;
}

table td{
  text-align: center;
  border-left: 1px solid #a8b7c5;
  border-bottom: 1px solid #a8b7c5;
  border-top:none;
  box-shadow: 0px -3px 5px 1px #eee inset;
  width: 25%;
  padding: 10px 0;
}

table td:last-child{
  border-right: 1px solid #a8b7c5;
}

table tr:last-child td:first-child {
  border-radius: 0 0 0 5px;
}

table tr:last-child td:last-child {
  border-radius: 0 0 5px 0;
}

.btn-square {
  margin: 0px 30px 0px 80px;
  display: inline-block;
  padding: 0.5em 1em;
  text-decoration: none;
  background: #668ad8;/*ボタン色*/
  color: #FFF;
  border-bottom: solid 4px #627295;
  border-radius: 3px;
}
.btn-square:active {
  /*ボタンを押したとき*/
  -webkit-transform: translateY(4px);
  transform: translateY(4px);/*下に動く*/
  border-bottom: none;/*線を消す*/
}

.btn-square-shadow {
  display: inline-block;
  padding: 0.5em 1em;
  text-decoration: none;
  background: #668ad8;/*ボタン色*/
  color: #FFF;
  border-bottom: solid 4px #627295;
  border-radius: 3px;
}
.btn-square-shadow:active {
  /*ボタンを押したとき*/
  -webkit-transform: translateY(4px);
  transform: translateY(4px);/*下に動く*/
  box-shadow: 0px 0px 1px rgba(0, 0, 0, 0.2);/*影を小さく*/
  border-bottom: none;
}
!

JS 

              
                $("#btn1").on("click", function(){
  // チェックされている値を配列に格納
  var chks = $('[class="chk"]:checked').map(function(){
      // 無効化する
      $(this).prop('disabled', true);
      // 値を返す
      return $(this).val();
  }).get();
  
  console.log(chks);
});

$("#btn2").on("click", function(){
  // 配列を宣言
  var arr = [];
  $('[class="chk"]:checked').each(function(){
      // 無効化する
      $(this).prop('disabled', true);
      // チェックされているの値を配列に格納
      arr.push($(this).val());
  });
  console.log(arr);
  
});
!
999px

Console