{"action":"created","comment":{"url":"https://api.github.com/repos/robdodson/a11y-api/pulls/comments/76839363","id":76839363,"diff_hunk":"@@ -0,0 +1,329 @@\n+<!-- START doctoc generated TOC please keep comment here to allow auto update -->\n+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->\n+**Table of Contents**\n+\n+- [Background: assistive technology and the accessibility tree](#background-assistive-technology-and-the-accessibility-tree)\n+  - [Accessibility node properties](#accessibility-node-properties)\n+- [Existing accessibility APIs](#existing-accessibility-apis)\n+  - [Native platform accessibility APIs](#native-platform-accessibility-apis)\n+  - [Gaps in the web platform's accessibility story](#gaps-in-the-web-platforms-accessibility-story)\n+  - [Audience for the proposed API](#audience-for-the-proposed-api)\n+- [The Accessibility Object Model](#the-accessibility-object-model)\n+  - [Exploring the accessibility tree](#exploring-the-accessibility-tree)\n+- [Use cases](#use-cases)\n+  - [Use DOM node references instead of IDREFs](#use-dom-node-references-instead-of-idrefs)\n+  - [Create virtual accessibility trees](#create-virtual-accessibility-trees)\n+\n+<!-- END doctoc generated TOC please keep comment here to allow auto update -->\n+\n+## Background: assistive technology and the accessibility tree\n+\n+Assistive technology, in this context, refers to a third party application\n+which augments or replaces the existing UI for an application.\n+One well-known example is a screen reader,\n+which replaces the visual UI and pointer-based UI\n+with an auditory output (speech and tones)\n+and a keyboard and/or gesture-based input mechanism,\n+completely separate from any audio output or keyboard or gesture input handled by the app.\n+\n+Many assistive technologies interact with a web page via accessibility APIs, such as\n+[UIAutomation](https://msdn.microsoft.com/en-us/library/windows/desktop/ee684009.aspx)\n+on Windows, or\n+[NSAccessibility](https://developer.apple.com/library/mac/documentation/AppKit/Reference/NSAccessibility_Protocol_Reference/)\n+on OS X.\n+These APIs allow an application to expose a tree of objects representing the application's interface,\n+typically with the root node representing the application window,\n+with various levels of grouping node descendants down to individual interactive elements.\n+This is referred to as the **accessibility 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don't like the idea of putting it here, since I think that's too deep a dive into HTML specifics at this point, but I'll try to add it later 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