HTML-CSS: Fullscreen

Last update on May 28 2022 07:25:34 (UTC/GMT +8 hours)

HTML-CSS : Exercise-21 with Solution

Using HTML, CSS applies styles to an element when in fullscreen mode.

Use the :fullscreen CSS pseudo-element selector to select and style an element that is displayed in fullscreen mode.
Use a <button> and Element.requestFullscreen() to create a button that makes the element fullscreen for the purposes of previewing the style.

HTML Code:

<!--License: https://bit.ly/3GjrtVF-->
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Using HTML, CSS applies styles to an element when in fullscreen mode</title>
</head>
<body>
<div class="w3rcontainer">
  <p><em>Click the button below to enter the element into fullscreen mode. </em></p>
  <div class="element" id="element"><p>w3resource.com change color in fullscreen mode!</p></div>
  <br />
  <button onclick="var el = document.getElementById('element'); el.requestFullscreen();">
    Go Full Screen!
  </button>
</div>
</body>
</html>

CSS Code:

<style> 
.w3rcontainer{
   border: 1px solid #cccfdb;
   margin: 40px auto;
   border-radius: 700px;
}


.element {
  padding: 20px;
  height: 300px;
  width: 100%;
  background-color: orange;
  box-sizing: border-box;
}

.element p {
  text-align: center;
  color: white;
  font-size: 3em;
}

.element:-ms-fullscreen p {
  visibility: visible;
}

.element:fullscreen {
  background-color: #CC56FF;
  width: 100vw;
  height: 100vh;
}
</style>

HTML-CSS Editor:

See the Pen html-css-practical-exercises by w3resource (@w3resource) on CodePen.

HTML-CSS: Tips of the Day

What is the difference between id and class in CSS, and when should I use them?

Example:

#header_id {font-color:#fff} .header_class {font-color:#000}

(Note that CSS uses the prefix # for IDs and . for Classes.)

However color was an HTML 4.01 <font> tag attribute deprecated in HTML 5. In CSS there is no "font-color", the style is color so the above should read:

Example:

#header_id {color:#fff} .header_class {color:#000}

The text would be white.

Ref: https://bit.ly/39Stv4P