If a product or service is not responsive to change it is inelastic

A(n) ________ is a note that an author or reviewer adds to a document

Fill in the blank(s) with correct word

Web Content Accessibility Guidelines (WCAG), Version 2.0, from the W3C, states that a website should not rely on the use of __________________ alone.

Fill in the blank(s) with the appropriate word(s).