A11y View: Geometric Optics: Basics
About the A11y View Tool
The A11y View is a design and presentation tool that we use to visually review and demonstrate the Interactive Description design of a simulation. The descriptions we design live within our accessibility layer, we call the Parallel DOM, or PDOM. The HTML of the PDOM provides document and interaction semantics for State Descriptions (copied into the blue box), and timely delivery of Responsive Descriptions (copied into the orange box). For a learner accessing the simulation with screen reader software, the State Descriptions provide on-demand access the current state of simulation while Responsive Descriptions deliver relevant changes - in real time - as the learner interacts with the simulation.
Please note that learners who use screen reader software do not use this A11y View, they use the same simulation that all learners use.