Web developers serious about accessible design ensure that all web page and app elements — buttons, links, form controls etc. — are reachable by the tab key on the keyboard.

Why?

Many users are physically unable to use a mouse, and need to navigate through the page using only the keyboard.

How can you test a website or app using only the keyboard?

Here are some common key combinations used when testing keyboard operation of web pages and apps:

Tab – move to the next link, form element or button.
Shift+Tab – move to the previous link, form element, or button.
Enter – activate the current link or button.
Space – check or uncheck a checkbox form element. Will also activate a button that currently has focus.
Up/Down arrow keys – move between radio buttons or, in some cases, menu links.
Right/Left arrow keys – in some cases, move between menu links or adjust sliders in audio and video plugins.
Escape – Close the current modal dialog or dropdown menu and return focus to the element that spawned it.

[SOURCE]

===

WEBSITE ACCESSIBILITY TESTING & REMEDIATION SERVICES: Mary Gillen is an experienced Website Accessibility Compliance Auditor and Remediator. She can test your website to determine if it meets accessibility standards:

WCAG 2.1: 312 checkpoints covering A, AA and AAA W3 accessibility guidelines
Section 508: 15 US federal guidelines covered by 59 accessibility checkpoints

Find out more about Mary Gillen’s Accessibility Testing & Remediation Services: Websites, PDFs, Office Docs & Videos

===