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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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About the <head>

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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

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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 

              
                <h1>MonoChromey</h1>
<p>Hold down on the image to temporarily cancel the effect</p>
<form>
  <input type="range" id="hue-input" min="0" max="360" value="60"><br>
  <input type="text" id="style-output" readonly>
</form>
<p class="image-holder">
  <img src="https://source.unsplash.com/1200x800/?nature,water" alt="Random water image from unsplash">
</p>

<p>Home: <a href="https://atornblad.se/">atornblad.se</a>, Twitter: <a href="https://twitter.com/atornblad">@atornblad</a>, Dev: <a href="https://dev.to/atornblad">@atornblad</a></p>
<p>Blog: <a href="https://atornblad.se/monochromey-css">atornblad.se/monochromey-css</a></p>
!

CSS 

              
                * {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

html {
  align-items: center;
}

body {
  background: #333;
  align-items: stretch;
  min-height: 100vh;
  font-family: sans-serif;
  color: #eee;
  text-align: center;
}

h1, p {
  margin-bottom: 0;
}

a:link, a:visited {
  color: #19f;
  text-decoration: underline;
}

a:link::first-letter {
  text-decoration: none;
}

body > * {
  max-width: 90vw;
}

p.image-holder > img {
  border-radius: 10px;
  box-shadow: 0 2px 3px 1px black;
  transition: filter 0.2s ease-in-out;
}

form {
  margin-top: 1rem;
}

input[type=text] {
  width: 100%;
  margin-top: 20px;
  font-family: monospace;
  font-size: 20px;
  border-radius: 5px;
  padding: 10px;
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  background: transparent;
}

input[type=range]:focus {
  outline: none;
}

input[type=range]::-ms-track {
  width: 100%;
  cursor: pointer;
  background: linear-gradient(to right, #f00, #ff0, #0f0, #0ff, #00f, #f0f, #f00);
  border-color: transparent;
  color: transparent;
}

input[type=range]::-webkit-slider-runnable-track{
  width: 100%;
  height: 15px;
  cursor: pointer;
  box-shadow: 1px 1px 1px #000000, 0px 0px 1px #0d0d0d;
  background: linear-gradient(to right, hsl(0deg 50% 50%), hsl(60deg 50% 50%), hsl(120deg 100% 50%), hsl(180deg 50% 50%), hsl(240deg 50% 50%), hsl(300deg 50% 50%), hsl(360deg 50% 50%));
  border-radius: 3px;
  border: 1px solid #010101;
}

input[type=range]:focus::-webkit-slider-runnable-track {
  background: linear-gradient(to right, hsl(0deg 100% 50%), hsl(60deg 100% 50%), hsl(120deg 100% 50%), hsl(180deg 100% 50%), hsl(240deg 100% 50%), hsl(300deg 100% 50%), hsl(360deg 100% 50%));
}

input[type=range]::-moz-range-track{
  width: 100%;
  height: 15px;
  cursor: pointer;
  box-shadow: 1px 1px 1px #000000, 0px 0px 1px #0d0d0d;
  background: linear-gradient(to right, hsl(0deg 50% 50%), hsl(60deg 50% 50%), hsl(120deg 100% 50%), hsl(180deg 50% 50%), hsl(240deg 50% 50%), hsl(300deg 50% 50%), hsl(360deg 50% 50%));
  border-radius: 3px;
  border: 1px solid #010101;
}

input[type=range]:focus::-moz-range-track {
  background: linear-gradient(to right, hsl(0deg 100% 50%), hsl(60deg 100% 50%), hsl(120deg 100% 50%), hsl(180deg 100% 50%), hsl(240deg 100% 50%), hsl(300deg 100% 50%), hsl(360deg 100% 50%));
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  border: 1px solid #000000;
  height: 36px;
  width: 16px;
  border-radius: 3px;
  background: #ffffff;
  cursor: pointer;
  margin-top: -12px;
  box-shadow: 1px 1px 1px #000000, 0px 0px 1px #0d0d0d; /* Add cool effects to your sliders! */
}

input[type=range]::-moz-range-thumb {
  box-shadow: 1px 1px 1px #000000, 0px 0px 1px #0d0d0d;
  border: 1px solid #000000;
  height: 36px;
  width: 16px;
  border-radius: 3px;
  background: #ffffff;
  cursor: pointer;
}

@media (max-width: 1279px) {
  p.image-holder > img {
    width: 800px;
    height: auto;
  }
  
  input[type=text] {
    font-size: 16px;
    padding: 8px;
  }
}

@media (max-width: 879px) {
  p.image-holder > img {
    width: 500px;
    height: auto;
  }
  
  input[type=text] {
    font-size: 14px;
    padding: 7px;
  }
}

@media (max-width: 579px) {
  p.image-holder > img {
    width: 300px;
    height: auto;
  }
  
  input[type=text] {
    font-size: 12px;
    padding: 6px;
  }
}
!

JS 

              
                const img = document.querySelector('p.image-holder > img');
const range = document.getElementById('hue-input');
const output = document.getElementById('style-output');

const setFilter = (filter) => {
  output.value = `filter: ${filter}`;
  img.style.filter = filter;
}

const handleHueInput = (hue) => {
  const filter = `sepia() hue-rotate(${hue - 60}deg)`;
  setFilter(filter);
};

const handleRange = (e) => {
  e && e.preventDefault();
  handleHueInput(parseInt(range.value, 10));
};

const handleMouseDown = (e) => {
  e && e.preventDefault();
  setFilter('none');
};

const handleMouseUp = handleRange;

handleRange();
range.addEventListener('input', handleRange );

img.addEventListener('mousedown', handleMouseDown);
img.addEventListener('mouseup', handleMouseUp);
img.addEventListener('touchstart', handleMouseDown);
img.addEventListener('touchend', handleMouseUp);
!
999px

Console