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Images of text have numerous accessibility concerns. Users with low vision may need to increase the font size, which doesn't work well with images and cause text to look pixelated. Some users may customize the display of web content to make it accessible, and images of text can't be customized to their preference.
Users that rely on keyboard navigation will expect a meaningful sequence when focusing on interactive elements. Links, buttons, inputs, and other controls have tab indexes built in. Adding positive tabindexes, if not managed correctly, can make the user jump all over the page and create a confusing experience.
Keyboard shortcuts can help make navigating or doing things on a page easier. If the shortcut uses only characters for typing though (letters, punctuation, symbols, etc.), this could lead to accidentally triggering actions the user doesn't intend to.
This can be especially frustrating for keyboard users, people using alternative pointing devices like head pointers, or people using speech input (i.e. saying a string of letters).
New in WCAG 2.2
Remembering a username and password, or identifying patterns in a CAPTCHA, can increase the cognitive effort needed to authenticate. This may especially affect people who have challenges with memory, reading, numbers, or other types of info processing. Having different ways of authenticating can help people verify their account or identity in ways that work for them.
There are many ways to operate a desktop or mobile device. Some assistive technology like alternative pointer devices, keyboard-only navigation, speech input, or switch devices can use websites better when interactive features are activated with a single click event. Path-based gestures like swiping, or a multi-point gesture like multiple fingers, can be more challenging with these input methods.
Users also need the ability to cancel any single point action, like single or double clicks and taps, long-presses or path-based gestures. If someone changes their mind about a particular action or accidentally clicks in the boundary, the action could go through immediately as they press down on the control, with no ability to revert a mistake.