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Component Model Strawman: Isolation
Overview
Loading an External HTML Resource
The element registration and template definition also can be done in an external, separate HTML resource. Author can define a set of elements inside the external HTML and use it in different HTML pages.
Effective markup vocabulary for the external HTML is limited. Agents only recognize the first head element and its descendant.
<html>
<head>
<element name="x-comment">..</element>
</head>
</html>
The host document
The document which hosts an external HTML file is called a "host document". Any HTML document can host be a host document.
If author add a link element with its rel attribute set to component to a apge, the page hosts the linked HTML resource.
In this example, the document hosts comment.html.
<html>
<head>
<link rel=”component” type=”text/html” href="comment.html">
</head>
</html>
The confined attribute
Author can add the confined attribute to confine the component definition.
<html>
<head>
<link rel=”component” type=”text/html” href="comment.html" confined>
</head>
</html>
If an author hosts an external HTML without specifying confined attribute, the HTML is hosted as a shared resource. That means, agents insert head children of the hosted document into the host document's head. Each script execution inside hosted HTML shares the global object with its host document.
In this example, the host document eventually has an element element named x-comment.
<!-- comment.html -->
<html>
<head>
<element name="x-comment">..</element>
</head>
</html>
<!-- host document -->
<html>
<head>
<link rel=”component” type=”text/html” href="comment.html">
<script>
var shouldNotNull = document.querySelector("element[name=x-comment]");
</script>
</head>
</html>
Confined Hosting
If an author hosts an external HTML without specifying confined attribute, the HTML is hosted as a confined resource.
A confined resource has its document object. ANy scripts inside the confined resource are run on its own global object.
<!-- comment.html -->
<html>
<head>
<element name="x-comment">
<script>
console.log(document.location.toString()); // prints the url of comment.html
<script>
</element>
</head>
</html>
<!-- host document -->
<html>
<head>
<link rel=”component” type=”text/html” href="comment.html" confined>
</head>
</html>