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              <button onclick="checkAPI();">Check if navigator.storage API's can run on your browser</button>

<button onclick="showEstimate();">Estimate Available Space</button>

<button onclick="queryForPermission();">Query For User Permission</button>

<button onclick="revokePermission();">Revoke User Permission</button>

<p class="message hasAPI">
  <span>navigator.storage.persist</span> and <span>navigator.storage.estimate</span> work fine.
</p>

<p class="message estimate"></p>

<p class="message permission"></p>

<p class="message error noAPI">
  You browser does not support <span>navigator.storage</span>
</p>

<p class="message error incompleteAPI">
  You browser has incomplete implementation of <span>navigator.storage</span>. Things like <span>navigator.storage.persist</span> and <span>navigator.storage.estimate</span> are used in this demo.
</p>
            
          
!
            
              

.message {
  padding: 20px;
  line-height: 2;
  border: 1px solid #f2f2f2;
  display: none;
  
  &.error {
    border: 1px solid #e60000;
    background: #ffb3b3;
    color: #e60000;
  }
  
  a {
    text-decoration: none;
    color: white;
    font-weight: bold;
  }
  
  span {
    border: 1px solid white;
    border-radius: 5px;
    padding: 5px;
    background: #f2f2f2;
  }
}

.show {
  display: block;
}

button {
  display: block;
  width: 50%;
  height: 50px;
  margin: 20px auto;
  background:  #99ff99;
  border: 1px solid #00e600;
  color: #008000;
  cursor: pointer;
}
            
          
!
            
              function checkAPI() {
  // this checks whether navigator.storage.persist and navigator.storage.estimate apis
  // can run or not
  if (!navigator.storage) {
    showMessage('.noAPI');
    return;
  }
  
  if(!navigator.storage.persist || !navigator.storage.estimate) {
    showMessage('.incompleteAPI');
    return;
  }
  
  showMessage('.hasAPI');
}

function showEstimate() {
  checkAPI();
  
  navigator.storage.estimate()
    .then(info => {
      document.querySelector('.estimate').innerHTML = `
            <span>Quota</span>: ${info.quota} Units and
            <span>Usage</span>: ${info.usage} Units
         `;
      showMessage('.estimate');
    })
}

function queryForPermission() {
  checkAPI();
  
  navigator.permissions.query({
    name: 'persistent-storage'
  })
  .then((info) => {
    console.log('info', info)
    if(info.state == 'prompt') {
      // start the prompt
      navigator.storage.persist()
      .then((data) => {
        document.querySelector('.permission').innerHTML = `
            <span>navigator.storage.persist()</span> 
            is asking for permissions. Please click on the 
            <span>Allow</span> button.
         `;
        showMessage('.permission');
      })
    }
    
    if(info.state == 'granted') {
      
      // you dont need permissions
      // for already enabled 
      navigator.storage.persist()
      .then((data) => {
        document.querySelector('.permission').innerHTML = `
            <span>navigator.storage.persist()</span> 
            has the permission set to 
            <span>granted</span>
         `;
        showMessage('.permission');
      })
    }
  })
  .catch((e) => {
    console.log(e)
  })
}

function revokePermission() {
  
  // dom.permissions.revoke.enable 
  // needs to be set to true
  navigator.permissions.revoke({
    name: 'persistent-storage'
  })
  .then((info) => {
    if(info.state == 'granted') {
      
      document.querySelector('.permission').innerHTML = `
          You permissions for 
          <span>navigator.storage.persist()</span> 
          has been <span>revoked</span>.
       `;
      showMessage('.permission');
      
    }
  })
  .catch((e) => {
    document.querySelector('.permission').innerHTML = `
        Nothing to revoke.
     `;
    showMessage('.permission');
  })
}

function showMessage(classname) {
  document.querySelector(classname).classList.add('show');
}
            
          
!
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