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We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <div class="container">
		<div id="editor" contenteditable="true" data-placeholder="Click here and type a word"></div>
              body {
	background-color: #131313;

#editor {
	width: 600px!important;
	height: 200px!important;
		color: #333;
	background-color: #fff;
  position: relative;
	padding: 10px 0 0 10px;
	font-family: Arial;
  font-size: 20px;
  outline: none;
  transition: all 0.4s ease;
  -webkit-transition: all -webkit-transform 0.4s ease;
  text-overflow: ellipsis;

  content: attr(placeholder);
  color: grey;
  display: block;

@-moz-document url-prefix() {
  #autoComplete {
    border-width: 1px;
    background-size: 1.2rem;
    background-origin: border-box;
    background-position: center;
              // THIS IS A WIP/PoC.

// Instructions: just start typing one of the `randomWords` and after the threshold of 2 characters (e.g after you type
// the `r` in `agreement`), the autocomplete placeholder will appear. Then just click the placeholder to complete the
// text (this behaviour will be controlled by Tab/Enter in future, but can't be implemented right now as it involves
// modifying the autoComplete.js library.)

// The placeholder doesn't work when formatting is active (e.g press ctrl+b and then try predictive text - it won't
// work). If you can solve this, fork the pen and contact me for a bounty 😊

const randomWords = [ 'elephant', 'rhinoceros', 'australia', 'reform', 'treaty', 'agreement', 'european union',
                      'europe', 'brussels', ' recast', 'domicile', 'america', 'compensation', 'liability',
                      'constitution', 'parliament' ];

// Thanks to for providing the core autocomplete engine, which has
// been modified to suit the needs of a rich text editor.
const autoCompletejs = new autoComplete( {
    data: {
        src: randomWords,
        cache: false
    selector: '#editor',
    threshold: 2,
    maxResults: 1,
    resultsList: {
        render: true,
        container: source => {
            source.setAttribute( 'id', 'suggestion__container' );
   = `display: inline-flex; font-family: Arial; font-size: 20px;
                    position: absolute;overflow: hidden;opacity: 0.5;z-index: 99999; color: grey;
                    overflow: hidden;transition: all 0.1s ease-in-out;
                    -webkit-transition: all -webkit-transform 0.1s ease;`;
        destination: document.querySelector( '#editor' ),
        element: 'div'
    resultItem: {
        content: (data, source) => {
            console.log( data );
            console.log( source );
            source.innerHTML = data.match;
        element: 'span'
    onSelection: feedback => {
        const editor = document.querySelector( '#editor' );

        const incompleteText = document.getSelection().anchorNode;
        const range = document.createRange();
        range.selectNodeContents( incompleteText );

        const _incompleteText = incompleteText.textContent;
        let autocompleteText = feedback.results[ 0 ];

        autocompleteText = autocompleteText.replace( _incompleteText, '' );

        insertTextAtCursor( autocompleteText );
        // Call `normalize` on the parent node after inserting the autocomplete text, otherwise 2 separate
        // text nodes will be rendered as the child nodes. These separate nodes may appear visually to be
        // a single word, but if they are not merged it can produce major formatting issues in future.
} );

// Hide Results list when not used
document.addEventListener( 'keydown', e => {
    const resultsList = document.querySelector( '#suggestion__container' );

    if ( e.key && e.key !== 'Backspace' ) {
        const editor = document.querySelector( '#editor' );

        // Don't activate predictive text if the caret if the caret has text ahead of it. Things will just get messy.
        if ( isCaretAtEnd( editor ) ) {
   = 'inline';
            console.log( resultsList );
            const incompleteText = document.getSelection().anchorNode;
            console.log( incompleteText );
            if ( incompleteText ) {
                const range = document.createRange();
                range.selectNodeContents( incompleteText );
                let coordinates = range.getClientRects();
                if ( coordinates.length > 0 ) {
                    coordinates = coordinates[ 0 ];
                    const { top, left } = coordinates;
                    // We create the visual effect of a placeholder element by overlaying the suggestion container
                    // at the exact position of the incomplete text. Can be a bit buggy but will be improved.
           = `${ top }px`;
           = `${ left }px`;
    } else { = 'none';
} );

function isCaretAtEnd(element) {
    let atEnd = false,

    if ( window.getSelection ) {
        const sel = window.getSelection();
        if ( sel.rangeCount ) {
            selRange = sel.getRangeAt( 0 );
            testRange = selRange.cloneRange();

            testRange.selectNodeContents( element );
            testRange.setEnd( selRange.startContainer, selRange.startOffset );

            testRange.selectNodeContents( element );
            testRange.setStart( selRange.endContainer, selRange.endOffset );
            atEnd = ( testRange.toString() === "" );

    return atEnd;

function insertTextAtCursor(text) {
    let selection,
    if ( window.getSelection ) {
        selection = window.getSelection();
        if ( selection.getRangeAt && selection.rangeCount ) {
            range = selection.getRangeAt( 0 );
            range.insertNode( document.createTextNode( text ) );

    placeCaretAtEnd( document.querySelector( '#editor' ) );

function placeCaretAtEnd(editor) {
    if ( typeof window.getSelection !== 'undefined' && typeof document.createRange !== 'undefined' ) {
        const range = document.createRange();
        range.selectNodeContents( editor );
        range.collapse( false );
        const sel = window.getSelection();
        sel.addRange( range );
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