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1. #Google chrome accessibility screen reader full
2. #Google chrome accessibility screen reader android
3. #Google chrome accessibility screen reader software

#Google chrome accessibility screen reader android

The Android accessibility API is of course based on Java. On macOS, the root node implements the NSAccessibility protocol and if you call, it returns and if you call, it returns “How old are you?”. Both APIs are maintained by the Linux Foundation. Historical note: IA2 was developed to extend MSAA/IAccessible to add richer document support, in a way that was harmonious with ATK, in order to simplify implementing them both within the same product. The Linux accessibility API, ATK, is similar to IAccessible2, aka IA2. On Windows, the root node implements the IAccessible protocol and if you call IAccessible::get_accRole, it returns ROLE_SYSTEM_DOCUMENT, and if you call IAccessible::get_accName, it returns “How old are you?”. On a particular platform, each node in the accessibility tree is implemented by an object that conforms to a particular protocol. The text field has a value, and instead of a name it has labelledByIds, which indicates that its accessible name comes from another node in the tree, the label node with id=2. Each node in the accessibility tree has an ID and a role. Note that the tree structure closely resembles the structure of the HTML elements, but slightly simplified. Id=3 role=TextField labelledByIds= value="42" Internally, Chromium represents the accessibility tree for that web page using a data structure something like this: id=1 role=WebArea name="How old are you?" The Accessibility Tree and Accessibility Attributes

#Google chrome accessibility screen reader full

While the core APIs tend to be well-documented, it's unfortunately common for screen readers in particular to depend on additional undocumented or vendor-specific APIs in order to fully function, especially with web browsers, because the standard APIs are insufficient to handle the complexity of the web.Ĭhromium needs to support all of these operating system and vendor-specific accessibility APIs in order to be usable with the full ecosystem of assistive technology on all platforms. Web browsers play an important role in this ecosystem because they need to not only provide access to their own UI, but also provide access to all of the content of the web.Įach operating system has its own native accessibility API.

#Google chrome accessibility screen reader software

In addition, because accessibility APIs provide a convenient and universal way to explore and control applications, they're often used for automated testing scripts, and UI automation software like password managers. Assistive learning and literacy software that helps users who have a hard time reading print, by highlighting and/or speaking selected text.Magnifiers that magnify a portion of the screen, and often highlight the cursor and caret for easier viewing, and.Switch Access that lets you control the computer with a small number of physical switches,.Voice control applications that let you speak to the computer,.Screen readers for blind users that describe the screen using synthesized speech or braille.However, when you see the word “accessibility” in a directory name in Chromium, that code‘s purpose is to provide full access to Chromium’s UI via external accessibility APIs that are utilized by assistive technology.Īssistive technology here refers to software or hardware which makes use of these APIs to create an alternative interface for the user to accommodate some specific needs, for example:

One piece of this involves basic design principles such as using appropriate font sizes and color contrast, avoiding using color to convey important information, and providing keyboard alternatives for anything that is normally accomplished with a pointing device. Accessibility means ensuring that all users, including users with disabilities, have equal access to software.