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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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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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HTML 

              
                <h1>Conditional Formatting</h1>
<div class="col">
  <h2>Cases</h2>
  <table>
    <tr>
      <th>Variant 1</th>
      <th>Variant 2</th>
      <th>Variant 3</th>
      <th>Variant 4</th>
      <th>Variant 5</th>
      <th>Variant 6</th>
      <th>Variant 7</th>
      <th>Variant 8</th>
    </tr>
    <tr>
      <td>1</td>
      <td>1</td>
      <td>2</td>
      <td>3</td>
      <td>10</td>
      <td>10</td>
      <td>10</td>
      <td>2</td>
    </tr>
    <tr>
      <td>2</td>
      <td>1</td>
      <td>1</td>
      <td>2</td>
      <td>2</td>
      <td>5</td>
      <td>9</td>
      <td>2</td>
    </tr>
    <tr>
      <td>3</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>4</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.75</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>5</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.65</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>6</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.5</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>7</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.35</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>8</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.25</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>9</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.15</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>10</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.1</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
    </tr>
    <tr>
      <td>11</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0</td>
      <td>0</td>
      <td>1</td>
      <td>1</td>
    </tr>
  </table>
  <table hidden>
    <tr>
      <th>Case 1</th>
      <th>Case 2</th>
      <th>Case 3</th>
      <th>Case 4</th>
      <th>Case 5</th>
      <th>Case 6</th>
      <th>Case 7</th>
      <th>Case 8</th>
    </tr>
    <tr>
      <td>1</td>
      <td>1</td>
      <td>2</td>
      <td>3</td>
      <td>10</td>
      <td>10</td>
      <td>10</td>
      <td>2</td>
    </tr>
    <tr>
      <td>2</td>
      <td>1</td>
      <td>1</td>
      <td>2</td>
      <td>2</td>
      <td>5</td>
      <td>9</td>
      <td>2</td>
    </tr>
    <tr>
      <td>3</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>4</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.75</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>5</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.65</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>6</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.5</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>7</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.35</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>8</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.25</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>9</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.15</td>
      <td>5</td>
      <td>5</td>
      <td>2</td>
    </tr>
    <tr>
      <td>10</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
      <td>0.1</td>
      <td>1</td>
      <td>1</td>
      <td>1</td>
    </tr>
  </table>
  <a href="#" id="colourise">Colourise Me</a>
</div>
<div class="col">
  <h2>Debugger</h2>
  <pre>Debugger Ready...</pre>
</div>
!

CSS 

              
                * {margin: 0; padding: 0; list-style: none; line-height: 1; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box;}
body {padding: 0 15px; font-family: 'Segoe UI';}
h1, h2 {font-weight: normal; padding: 0 0 15px; text-shadow: 0 0 1px rgba(0,0,0,0.5);}
table {width: 100%; text-align: center; border-collapse: collapse;}
th, td {border: 1px solid #ccc; padding: 5px;}
strong, th {text-shadow: 0 0 1px rgba(0,0,0,0.25); font-weight: 600;}
td {font-family: 'Monaco', 'Consolas', monospace;}
#colourise {text-decoration: none; margin: 10px 0; display: inline-block; padding: 5px 5px 6px; border-radius: 5px; color: #000; -webkit-box-shadow: 0px 0px 3px 0px rgba(0,0,0,0.75); -moz-box-shadow: 0px 0px 3px 0px rgba(0,0,0,0.75); box-shadow: 0px 0px 3px 0px rgba(0,0,0,0.75); overflow: hidden;}
#colourise:hover {background-color: #ccf;}
pre {border: 1px solid #ccc; padding: 3px; font-family: 'Monaco', 'Consolas', monospace;}
pre span {color: #f90; text-shadow: 0 0 1px rgba(0,0,0,0.5);}
@media screen and (min-width: 960px) {
  .col {width: 50%; float: left; padding-left: 15px;}
  .col:first-child {padding: 0;}
}
.high {background-color: #f00;}
.medium {background-color: #ffbf00;}
.low {background-color: #090;}
!

JS 

              
                function log (stuff) {
  if (typeof stuff == "object" && !(stuff instanceof Array))
    document.querySelector("pre").innerHTML += "\n" + JSON.stringify(stuff, null, 2);
  else if (stuff instanceof Array)
    document.querySelector("pre").innerHTML += "\n[" + stuff.join(", ") + "]";
  else
    document.querySelector("pre").innerHTML += "\n" + stuff;
}
function getColumnValues (tableSelector, colN) {
  colN = colN || 1;
  colN--;
  var myTable = document.querySelector(tableSelector);
  var values = [];
  for (var i = 1, n = myTable.rows.length; i < n; i++)
    // Assuming all the values are numbers. Don't use this function for 
    values.push(parseFloat(myTable.rows[i].cells[colN].innerHTML.trim()));
  return values;
}
function addClassToColumnCells (tableSelector, colN, valObj) {
  colN = colN || 1;
  colN--;
  var myTable = document.querySelector(tableSelector);
  for (var i = 1, n = myTable.rows.length; i < n; i++) {
    curTD = myTable.rows[i].cells[colN];
    curVal = curTD.innerHTML.trim();
    if (typeof valObj[curVal] !== "undefined")
      curTD.classList.add(valObj[curVal]);
  }
}
window.onload = function () {
  document.getElementById("colourise").onclick = function () {
    var StartTS = Date.now();
    for (var c = 1; c <= 8; c++) {
      log("");
      log("<strong>Working on Case " + c + ".</strong>");
      log("Get all the values in an array.");
      var colVals = getColumnValues("table", c);
      log(colVals);
      log("Get all the unique values in the array.");
      colVals = colVals.filter(function (value, index, self) {
        return self.indexOf(value) === index;
      });
      log("Sorting all the values by descending order.");
      colVals.sort(function (a, b) {
        return b - a;
      });
      log(colVals);
      log("The length of the whole array is: " + colVals.length);
      var colourMapping = {};
      if (colVals.length < 2)
        log("<span>Only " + colVals.length + " value found. No colouring.</span>");
      else if (colVals.length == 2) {
        log("<span>Hard Coding Values. Two colours.</span>");
        colourMapping[colVals[0]] = "high";
        log(colVals[0] + " is coloured red.\n" + colVals[1] + " is not coloured.");
      } else if (colVals.length == 3) {
        log("<span>Hard Coding Values. Three colours.</span>");
        colourMapping[colVals[0]] = "high";
        colourMapping[colVals[1]] = "medium";
        colourMapping[colVals[2]] = "low";
        log(colVals[0] + " is coloured red.\n" + colVals[1] + " is coloured amber.\n" + colVals[2] + " is coloured green.");
      } else {
        log("<span>Implementing Bucket Method.</span>");
        var quotient = parseInt(colVals.length / 3);
        var mapping = [quotient, quotient, quotient];
        for (var m = 0, reminder = colVals.length % 3; reminder > 0; reminder--, m++)
          mapping[m]++;
        log("The first " + mapping[0] + " elements will be red.");
        log("The next " + mapping[1] + " elements will be amber.");
        log("The rest " + mapping[2] + " elements will be green.");
        for (var i = 0; i < mapping[0]; i++)
          colourMapping[colVals[i]] = "high";
        for (; i < mapping[0] + mapping[1]; i++)
          colourMapping[colVals[i]] = "medium";
        for (; i < mapping[0] + mapping[1] + mapping[2]; i++)
          colourMapping[colVals[i]] = "low";
      }
      if (Object.keys(colourMapping).length) {
        log("<span>Verbose:</span>");
        log(colourMapping);
        log("");
        log("<strong>Applying the colours for column " + c + "...</strong>");
        addClassToColumnCells ("table", c, colourMapping);
        log("<span>Successfully applied colours for column " + c + ".</span>");
      }
    }
    log("");
    var EndTS = Date.now();
    log("<strong>Completed in " + (EndTS - StartTS) + " ms.</strong>");
    return false;
  };
};
!
999px

Console