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HTML

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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

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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 

              
                <article>
  <figure>
    <img src="https://fakeimg.pl/150/">
  </figure>
  <form>
  <input type="text" placeholder="Introduce tu nombre"/>
  <input id="rangeField" type="range" list="mydata" min="0" max="100" value="20" step="1" oninput="changeVar(rangeField.value,rangeField.min, rangeField.max)">
  <output id="output" value="20"></output>
  <fieldset>
    <input type="radio" name="gender" aria-label="Hombre"/>
    <input type="radio" name="gender" aria-label="Mujer"/>
  </fieldset>
    <div class="buttonSet">
      <button type="button">Cancelar</button>
        <button type="button" class="submit">Guardar</button>
      </div>
</form>
<article>
!

CSS 

              
                $module: 48px;
$spacing: 12px;
*{box-sizing: border-box}
body {
  margin: 0;
  background: #f0f0f0;
  font: normal 14px Arial, Helvetica, san-serif;
  color: #336;
}
article {
  display: flex;
  align-content: center;
  align-items: center;
  justify-content: center;
}
figure {
  display: inline-block;
  overflow: hidden;
  width: auto;
  padding: 9px;
  border-radius: 50%;
  border: solid 1px white;
  box-shadow: 4px 4px $spacing 6px rgba(0,0,0,.05), -4px -4px $spacing 6px rgba(255,255,255,1), inset 4px 4px $spacing rgba(0,0,0,0.05), inset -4px -4px $spacing rgba(255,255,255,.5);
}
img {
  display: block;
  border-radius: 50%;
}
form {
  // padding: $spacing;
  width: 300px;
}
[type=text]{
/*   display: block; */
  width: 100%;
  margin: $spacing 0;
  padding: $spacing $module/2;
  line-height: $spacing;
  border-radius: $module/2;
  border: 0;
  outline: solid 1px rgba(255,255,255,0.5);
/*   border-color: #fff #eee #eee #fff; */
  box-shadow: inset 3px 3px 9px rgba(0,0,0,0.125), inset -3px -3px 9px rgba(255,255,255,1);
  background: transparent;
}
[type=text]:focus {
  background: #f6f6f6;
}
fieldset {
  box-sizing: border-box;
  display: inline-block;
  width: 100%;
  margin: $spacing 0;
  padding: 0;
  font-size: 0;
  border: none;
  border-radius: $module/2;
  box-shadow: 3px 3px 9px rgba(0,0,0,0.15), -3px -3px 9px 3px rgba(255,255,255,1);
  background: #ccc;
  outline: solid 1px rgba(255,255,255,0.5);
}

[type=radio]{
  display: inline-block;
  appearance: none;
  width: 50%;
  margin: 0;
  padding: 0;
  text-align: center;
  cursor: pointer;
}
[type=radio]:after {
  content: attr(aria-label);
  box-sizing: border-box;
  display: block;
  height:$module - 4px;
  padding: $spacing $module/2;
  font-weight: bold;
  line-height: $module/2;
  color: #99F;
  border: solid 1px rgba(255,255,255,0.2);
  background: #f0f0f0;
}
[type=radio]:first-child:after {
  border-radius: $module/2 0 0 $module/2;
}
[type=radio]:last-child:after {
  border-radius: 0 $module/2 $module/2 0;
}
[type=radio]+[type=radio]:after {
  margin-left: 1px;
}
[type=radio]:checked:after {
  box-shadow: inset 3px 3px 9px rgba(0,0,0,0.15), inset -3px -3px 9px rgba(255,255,255,1);
  color: #33A;
  background: #f6f6f6;
}
[type=range]{
   -webkit-appearance: none;
  width: calc(100% - 90px);
  margin: $spacing;
  vertical-align: middle;
  border: none;
  outline: none;
  border-radius: $spacing/2;
  background: transparent;
}
@mixin track() {
  height: $spacing*2/3;
  padding: 0;
  cursor: pointer;
  border-radius: $spacing/2;
  box-shadow: inset 2px 2px 6px rgba(10,10,100,.5), inset -2px -2px 6px rgba(200,200,255,.5);
  background: linear-gradient(to right, #99F 0%, rgba(#33A,1) var(--progressW), #f0f0f0 var(--progressW), #f0f0f0 100%);
  border: solid 1px rgba(white,0.75);
}
@mixin thumb() { 
  box-sizing: border-box;/*FF*/
  -webkit-appearance: none;
  width: $module/2;
  height: $module/2;
  margin-top: -$spacing*2/3-1px;
  border: $spacing/2 solid #eee;
  border-radius: 50%;
  background: #99F;
  box-shadow: 0 1px 4px rgba(0, 0, 0, .5), inset 1px 1px 3px rgba(#336,.5);
}
@mixin active() {
    width: $module*0.75;
    height: $module*0.75;
    margin-top: -$spacing*1.25;
    background: #99F;
}
@mixin progress() {
    // background: #99F;
  background: transparent;
}
[type=range] {
  &::-webkit-slider-runnable-track { @include track }
  &::-moz-range-track { @include track }
  &::-ms-track { @include track }

  &::-webkit-slider-thumb { @include thumb }
  &::-moz-range-thumb { @include thumb }
  &::-ms-thumb { @include thumb }

  &:active::-webkit-slider-thumb { @include active }
  &:active::-moz-range-thumb { @include active }
  &:active::-ms-thumb { @include active }
  
  &::-moz-range-progress { @include progress }
  &::-ms-fill-upper { @include progress }
}
output {
  white-space: nowrap;
}

.buttonSet {
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-between;
}
button {
  box-sizing: border-box;
  width: calc(50% - #{$spacing});
  height: $module;
  margin: $spacing 0;
  padding: $spacing;
  font-weight: bold;
  color: #99F;
  border: solid 4px #f0f0f0;
  border-radius: $module/2;
  --borderCLR: rgba(0,0,0,.15);
  --lightCLR: rgba(240,240,255,.5);
  --shadowCLR: rgba(0,0,0,0.05);
  box-shadow: 0px 0px 1px 1px var(--borderCLR), 0px 0px 2px 2px white, inset 3px 3px 9px var(--shadowCLR), inset -3px -3px 9px var(--lightCLR);
  // outline: solid 1px white;
  background: transparent;
  cursor: pointer;
}
.submit {
  color: white;
  border-color: #99F;
  background-color: #99F;
  --lightCLR: rgba(200,200,255,.75);
  --shadowCLR: rgba(0,0,100,0.15);
  
}
button:active {
  position: relative;
  top: 2px;
  left: 1px;
  box-shadow: -1px -1px 1px 1px var(--borderCLR), -1px -1px 2px 2px white, inset 3px 3px 9px var(--shadowCLR), inset -3px -3px 9px var(--lightCLR);
  border-width: 4px 2px 2px 4px;
}
@media all and (max-width:600px) {
  article {
    flex-direction: column;
  }
}
!

JS 

              
                function changeVar(value, min, max){
  var range = max - min;
  var progressW = Math.round((value-min)/range*100);
  $('#rangeField').css('--progressW', progressW +'%');
  $('#output').val(progressW +' años')
};
changeVar(20,0,100);
!
999px

Console