Standard Markup
Indigo components incorporate standard markup and ARIA roles based on W3C standards and industry best practices. ARIA (Accessible Rich Internet Applications) is a spec from the W3C created to improve accessibility of applications by providing extra information to screen readers via HTML attributes. Following these standards allows assistive technologies to gather information, activate and keep current on the status of user interface controls.
Applicable component guideline pages have sections describing any special accessibility considerations that should be taken when implementing the specific component in products / web properties.