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tour with clip-path

A Pen By ladybenko

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HTML

            
              <article class="content">
  <header>
    <h1>Lorem ipsum</h1>
    <p><a href="#" id="rss">RSS feed</a></p>
  </header>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
  <footer><p><button id="action">A button here</button></p></footer>
</article>

<div class="overlay">
  <div id="banner">
    <h1>Hola</h1>
    <h2>Click anywhere to continue</h2>
  </div>
  <div id="indication">
    <span class="message">Lorem ipsum</span>
   <svg class="arrow" width="50" height="20">
     <rect x="0" y="5" width="30" height="10" />
     <polygon points="30 0, 50 10, 30 20"/>
    </svg>
    </div>
</div>
!

CSS

            
              .content {
  max-width: 600px;
  margin: 0 auto;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: none;
}

#indication {
  position: absolute;
  display: none;
}

#banner {
  position: absolute;
  display: none;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  background: rgba(255, 255, 255, 0.8);
  padding: 1em;
}

.message { 
  margin: 0 0.5em;
}

.flipped {
  transform: scaleX(-1); 
}
!

JS

            
              const TOUR = [
  { msg: 'Begin of tour'},
  { msg: 'Subscribe here to our RSS feed', selector: '#rss'}, 
  { msg: 'Dolors sit amet', selector: '#action'},
  { msg: 'Have fun!'}
];

const sign = document.querySelector('#indication');
const textBanner = document.querySelector('#banner');
const overlay = document.querySelector('.overlay');
var content = document.querySelector('.content');

playTour(TOUR);

function playTour(tour) {
  overlay.style.display = 'block';

  let currentStep = 0;
  showNext(TOUR[currentStep]);
  
  let clickHandler = function () {
    currentStep++;

    if (currentStep >= tour.length) { // end
      overlay.removeEventListener('click', clickHandler);
      overlay.style.display = 'none';
      unclip();
    }
    else {
      showNext(TOUR[currentStep]);
    }
  }
  
  let click = overlay.addEventListener('click', clickHandler);
}

function showNext(step) {
  if (step.selector) { // element an arrow must point to
    textBanner.style.display = 'none';
    sign.style.display = 'flex';
    pointMessage(sign, step.msg, document.querySelector(step.selector));
    clipElement(document.querySelector(step.selector));
  }
  else {
    textBanner.querySelector('h1').innerHTML = step.msg;
    textBanner.style.display = 'block';
    sign.style.display = 'none';
    unclip();
  }
}

function clipElement(el) {
  let containerBounds = content.getBoundingClientRect();
  let elBounds = el.getBoundingClientRect();
  
  let clip = {
    top: elBounds.top - containerBounds.top,
    left: elBounds.left - containerBounds.left,
    right: containerBounds.left + containerBounds.width - (elBounds.left + elBounds.width),
    bottom: containerBounds.top + containerBounds.height - (elBounds.top + elBounds.height)
  };
  
  let inset = `inset(${clip.top}px ${clip.right}px ${clip.bottom}px ${clip.left}px)`;
  content.style['-webkit-clip-path'] = inset;
  content.style['clip-path'] = inset;
}

function unclip() {
  content.style['-webkit-clip-path'] = 'none';
  content.style['clip-path'] = 'none';
}

function pointMessage(sign, msg, el) {
  const PADDING = 5;  
  let signBox = sign.getBoundingClientRect();
  
  sign.style.left = `${el.offsetLeft - signBox.width - PADDING}px`;
  sign.style.top = `${el.offsetTop - signBox.height / 2 + el.getBoundingClientRect().height / 2}px`;
}
!
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