iframe

Attributes -

1. Global Attributes include
2. Allow = Specifies a feature policy for the Feature policy= allows web developers to selectively enable, Disable, and modify the behavior of certain features andAPIs in the browser
3. Referrerpolicy = Specifies which referrer information to send when fetching the iframe

Examples of feature policy -

1. Change the default behavior of autoplay on mobile and third party videos
2. Restrict a site from using sensitive devices like the camera, microphone, or speakers.
3. Block the use of outdated APIs like synchronous XHRand document.write()

Iframe Allow Attribute = Use the allow attribute to specify a policy list for embedded content. this blocks the iframe from using the camera and microphone:

<iframe allow="camera 'none'; microphone 'none'">…</iframe>

Window Objects ->

it can be accessed by index numbers

1. frameElement property - returns the frame where the window runs.
   A frame can be any embedding element: <frame>, <iframe>, <embed>, <object>, etc.
2. window.length - property returns the number of (framed) windows in the window.
3. frames property - returns an array with all window objects in the window Its change the location of the first iframe element (index 0)

function myFunction() {
  window.frames[0].location = "https://www.w3schools.com/jsref/";
}

HTML DOM IFrame Object

1. Create an IFrame Object - by using the document.createElement() method

function myFunction() {
  var x = document.createElement("IFRAME");
  x.setAttribute("src", "https://www.w3schools.com");
  document.body.appendChild(x); // appends a node (element) as the 
                                                      last child of an element
}

1. The sandbox attribute - enable security restrictions for iframes with untrusted content (such as scripts and forms).

IFrame object also supports the standard HTML DOM Elements and HTML DOM Events

Window.parent - property is a reference to the parent of the current window or subframe. window.top - returns a reference to the top-level window.