Increasing access

Currently, there is not a guidance/reminder for adding accessible name to iframe element. (See: processing/p5.js-website#1115)

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

Feature enhancement details

In contributor_docs directory, update the documentation style guide. On release, this is used to generate the online contributor doc (beta site, main site).

This can be a very short, clear section before/after "Accessible Canvas Labels." Please refer to parent issue for relevant context and links.