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The aim of this article is to outline how the new Web API (WebExtensions API) can add new features and functionality based on the
For a full overview of the new features, be sure to read “Web APIs” and “WebExtensions API”.
The new APIs have 3 major parts:
The canvas tag supports a number of new APIs related to drawing and manipulating your DOM with the canvas element , the element itself or the canvas element’s children.
tag supports a number of new APIs related to drawing and manipulating your DOM with the tag , the element itself or the the canvas element’s . The drawable-canvas tag exposes several APIs for drawing directly into the DOM, and accessing the DOM through the window object’s document object or some other element.
tag exposes several APIs for drawing directly into the DOM, and accessing the DOM through the object’s object or some other element. The canvas element object allows you to create and manipulate DOM items on the canvas , as well as the elements within the canvas .
element object allows you to create and manipulate DOM items on the , as well as the elements within the . All the API changes in this section take place within the context of using the canvas element . This section also lists how the new APIs differ from existing APIs.
The following subsections describe new APIs or features which you can read more about and which are described further in the Web API Reference (W3C)
The canvas element provides new APIs for drawing into the DOM by accessing the window object’s document and DOM objects. It also allows you to interact with the window object during drawing by setting the canvas element’s width , padding and position , and optionally, the height of the element’s frame (if the window object has any). You can change the canvas element’s height , if you would like to make the element smaller or larger without changing any of the elements’ height properties.
Note that the window object and its children are not thread-safe (they always reference the same parent). If you call a method that uses the window object to call a method on
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