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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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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

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <form action="#" method="post">
  <p>
    <label for="fecha_inicial">Fecha inicial (YYYY-MM-DD)</label>
    <input type="text" id="fecha_inicial" value="" />
  </p>
  <p>
    <label for="fecha_inicial">Fecha inicial (YYYY-MM-DD)</label>
    <input type="text" id="fecha_final" value="" />
  </p>
  <p>
    <input type="button" id="calcula" value="Calcular segundos" /> 
  </p>
  <div id="consola">Segundos</div>
</form>
!

CSS 

              
                input { padding: 5px; font-size: 13pt; }
#consola { padding: 5px; background: #EEE; }
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JS 

              
                $( "#calcula" ).click(function() {
  if ( $("#fecha_inicial").val()!="" && $("#fecha_final").val()!="" ){
    // Capturamos valores de los campos
    var tiempo1tmp= $("#fecha_inicial").val();
    var tiempo2tmp= $("#fecha_final").val();
    // Separamos la fecha por el guión
    var tiempo1split= tiempo1tmp.split('-');
    var tiempo2split= tiempo2tmp.split('-');
    // Creamos las fechas 
    var tiempo1 = new Date(tiempo1split[0], tiempo1split[1], tiempo1split[2], 0, 0, 0, 0)
    var tiempo2 = new Date(tiempo2split[0], tiempo2split[1], tiempo2split[2], 0, 0, 0, 0)
    var dif = tiempo1.getTime() - tiempo2.getTime()

    var Segundos_de_T1_a_T2 = dif / 1000;
    var Segundos_entre_fechas = Math.abs(Segundos_de_T1_a_T2);
    
    $("#consola").html("Segundos: "+ Segundos_entre_fechas);
  } else {
      $("#consola").html("Debe rellenar los campos con fechas");
  }
});
!
999px

Console