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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

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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

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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Packages

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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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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.

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HTML 

              
                <div id="toolbar-wrap">
  <div id="toolbar">
    <button class="button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><path fill="none" d="M0 0h24v24H0z"/><path d="M8 11h4.5a2.5 2.5 0 1 0 0-5H8v5zm10 4.5a4.5 4.5 0 0 1-4.5 4.5H6V4h6.5a4.5 4.5 0 0 1 3.256 7.606A4.498 4.498 0 0 1 18 15.5zM8 13v5h5.5a2.5 2.5 0 1 0 0-5H8z"/></svg></button>
    <div class="button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><path fill="none" d="M0 0h24v24H0z"/><path d="M15 20H7v-2h2.927l2.116-12H9V4h8v2h-2.927l-2.116 12H15z"/></svg></div>
    <div class="button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><path fill="none" d="M0 0h24v24H0z"/><path d="M8 3v9a4 4 0 1 0 8 0V3h2v9a6 6 0 1 1-12 0V3h2zM4 20h16v2H4v-2z"/></svg></div>
  </div>
</div>

<div id="editor" contentEditable="true">
  <p>This is a very long editable area.</p>
  <p>The problem is, when you focus in this area on an iOS device, a keyboard pops up and that beautiful fixed toolbar at the top gets hidden.</p>
  <p>You will need to fork this pen and view in debug mode on an iOS device to see the fix in action (so that you are not viewing it inside an iframe).</p>
  <p>You might need to scroll down a bit to see the header disappear.</p>
  <p>Let's fix this problem, using JavaScript!</p>
  <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p> <p>...</p><p>...</p>
    <p>This is a very long editable area.</p>
  <p>The problem is, when you focus in this area on an iOS device, a keyboard pops up and that beautiful fixed toolbar at the top gets hidden.</p>
  <p>Let's fix this problem, using JavaScript!</p>
  
</div>
!

CSS 

              
                body {
  margin: 0px;
}

#editor {
  padding: 5px 20px;
}

#editor:focus {
  outline: 2px solid transparent;
}

#toolbar-wrap {
  position: sticky;
  top: 0px;
  height: 60px;
  width: 100%;
}

#toolbar {
  position: absolute;
  left: 0px;
  right: 0px;
  padding: 15px;
  background-color: #f1f5f9;
}

#toolbar.down {
  transition-property: all;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 500ms;
}

.button {
  border-radius: 5px;
  background-color: transparent;
  border: 0px;
  padding: 3px 5px;
  line-height: 0px;
  display: inline-block;
  margin: 1px;
  cursor: pointer;
}

.button:hover {
  background-color: #e2e8f0;
}
!

JS 

              
                let fixPosition = 0; // the fix
let lastScrollY = window.pageYOffset; // the last scroll position
let toolbarWrap = document.getElementById('toolbar-wrap'); // the toolbar wrap
let toolbar = document.getElementById('toolbar'); // the toolbar
let editor = document.getElementById('editor'); // the editor

// function to set the margin to show the toolbar if hidden
const setMargin = function() {
  // if toolbar wrap is hidden
  const newPosition = toolbarWrap.getBoundingClientRect().top;
  if (newPosition < -1) {
    // add a margin to show the toolbar
    toolbar.classList.add("down"); // add class so toolbar can be animated
    fixPosition = Math.abs(newPosition); // this is new position we need to fix the toolbar in the display
    // if at the bottom of the page take a couple of pixels off due to gap
    if ((window.innerHeight + window.pageYOffset) >= document.body.offsetHeight) {
      fixPosition -= 2;
    }
    // set the margin to the new fixed position
    toolbar.style["margin-top"] = fixPosition + "px";
  }
}

// use lodash debounce to stop flicker
const debounceMargin = _.debounce(setMargin, 150);

// function to run on scroll and blur
const showToolbar = function() {
  // remove animation and put toolbar back in default position
  if (fixPosition > 0) {
    toolbar.classList.remove("down");
    fixPosition = 0;
    toolbar.style["margin-top"] = 0 + "px";
  }
  // will check if toolbar needs to be fixed
  debounceMargin();
}

// add an event listener to scroll to check if
// toolbar position has moved off the page
window.addEventListener("scroll", showToolbar);
// add an event listener to blur as iOS keyboard may have closed
// and toolbar postition needs to be checked again
editor.addEventListener("blur", showToolbar);
!
999px

Console