Fix:PhET simulations

Accessibility enhancements for PhET interactive science simulations, including HTML5 canvas and SVG.

PhET provides fun, interactive, research-based simulations of physical phenomena for free. We believe that our research-based approach- incorporating findings from prior research and our own testing- enables students to make connections between real-life phenomena and the underlying science, deepening their understanding and appreciation of the physical world. University of Colorado Boulder.

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