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If there are any validation messages, the focus is set to the first invalid input: this way, a screen reader will immediately announce the associated message, so the user knows that there is at least one invalid input to be fixed.

For multiple radio buttons or checkboxes, the message is associated to the surrounding <fieldset>.

In addition to this, each invalid input is associated to its message using aria-describedby. This is important, as it makes sure that screen readers also announce the messages when navigating through the inputs using the Tab key.

online tool simulates colour blindness on an image that you upload or on a web page that you specify, while the Photoshop plugin changes the colours of the document you are working on

/* * Hide from both screenreaders and browsers: h5bp.com/u */.hidden {    display: none !important;    visibility: hidden;}/* * Hide only visually, but have it available for screenreaders: h5bp.com/v */.visuallyhidden {    border: 0;    clip: rect(0 0 0 0);    height: 1px;    margin: -1px;    overflow: hidden;    padding: 0;    position: absolute;    width: 1px;}/* * Extends the .visuallyhidden class to allow the element to be focusable * when navigated to via the keyboard: h5bp.com/p */.visuallyhidden.focusable:active,.visuallyhidden.focusable:focus {    clip: auto;    height: auto;    margin: 0;    overflow: visible;    position: static;    width: auto;}/* * Hide visually and from screenreaders, but maintain layout */.invisible {    visibility: hidden;}

Currently browsers do not support keyboard navigation via landmark roles, so for keyboard users who do not also use assistive tech, a visible skip link is needed.