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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

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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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About Packages

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.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div class="demo-preview">
  <div class="progress progress-striped active">
      <div role="progressbar progress-striped" style="width: 95%;" class="progress-bar"><span>Primary</span></div>
    </div>
    <div class="progress progress-striped active">
      <div role="progressbar " style="width: 90%;" class="progress-bar progress-bar-secondary"><span>Secondary</span></div>
    </div>
    <div class="progress progress-striped active">
      <div role="progressbar " style="width: 80%;" class="progress-bar progress-bar-default"><span>Default</span></div>
    </div>
    <div class="progress progress-striped active">
      <div role="progressbar " style="width: 70%;" class="progress-bar progress-bar-success"><span>Success</span></div>
    </div>
    <div class="progress progress-striped active">
      <div role="progressbar " style="width: 60%;" class="progress-bar progress-bar-info"><span>Info</span></div>
    </div>
    <div class="progress progress-striped active">
      <div role="progressbar " style="width: 50%;" class="progress-bar progress-bar-warning"><span>Warning</span></div>
    </div>
    <div class="progress progress-striped active">
      <div role="progressbar" style="width: 40%;" class="progress-bar progress-bar-danger"><span>Danger</span></div>
    </div>
</div>
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CSS 

              
                .demo-preview {
  padding-top: 100px;
  padding-bottom: 10px;
  margin: auto;
  width:50%;
  text-align: center;
}
$brand-default: #B0BEC5;
$brand-primary: #2196F3;
$brand-secondary: #323a45;
$brand-success: #64DD17;
$brand-warning: #FFD600;
$brand-info:  #29B6F6;
$brand-danger: #ef1c1c;
$bg-light-gray: #f5f5f5;
.progress {
  background-color: $bg-light-gray;
  border-radius: 3px;
  box-shadow:none;
  &.progress-xs {
    height: 5px;
    margin-top: 5px;
  }
  &.progress-sm {
    height: 10px;
    margin-top: 5px;
  }
  &.progress-lg {
    height: 25px;
  }
  &.vertical {
    position: relative;
    width: 20px;
    height: 200px;
    display: inline-block;
    margin-right: 10px;
    > .progress-bar {
      width: 100%!important;
      position: absolute;
      bottom: 0;
    }
    &.progress-xs {
      width: 5px;
      margin-top: 5px;
    }
    &.progress-sm {
      width: 10px;
      margin-top: 5px;
    }
    &.progress-lg {
      width: 30px;
    }
  }
}

.progress-bar {
  background-color: $brand-primary;
  box-shadow:none;
  &.text-left{
    text-align: left;
    span{
      margin-left: 10px;
    }
  }
  &.text-right{
    text-align: right;
    span{
      margin-right: 10px;
    }
  }
}
@mixin gradient-striped($color: rgba(255,255,255,.15), $angle: 45deg) {
  background-image: -webkit-linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
  background-image: -o-linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
  background-image: linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
}

@-webkit-keyframes progress-bar-stripes {
  from  { background-position: 40px 0; }
  to    { background-position: 0 0; }
}

// Spec and IE10+
@keyframes progress-bar-stripes {
  from  { background-position: 40px 0; }
  to    { background-position: 0 0; }
}

@mixin animation($animation) {
  -webkit-animation: $animation;
       -o-animation: $animation;
          animation: $animation;
}
.progress.active .progress-bar,
.progress-bar.active {
  @include animation(progress-bar-stripes 2s linear infinite);
}
.progress-striped .progress-bar,
.progress-bar-striped {
  @include gradient-striped;
  background-size: 40px 40px;
}
@mixin progress-bar-variant($color) {
  background-color: $color;
}

.progress-bar-secondary {
  @include progress-bar-variant($brand-secondary);
}

.progress-bar-default {
   @include progress-bar-variant($brand-default);
}



.progress-bar-success {
   @include progress-bar-variant($brand-success);
}

.progress-bar-info {
   @include progress-bar-variant($brand-info);
}

.progress-bar-warning {
   @include progress-bar-variant($brand-warning);
}

.progress-bar-danger {
   @include progress-bar-variant($brand-danger);
}
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JS
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999px

Console