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Alt text provides a textual alternative to non-text content in webpages, which is essential for users with visual impairments to understand the content via screen readers. Implementation involves adding a descriptive 'alt' attribute to img tags.

ARIA labels provide accessible names and descriptions for interactive elements and landmarks which aid in navigation and interaction for screen reader users. Implement by adding 'aria-label' or 'aria-labelledby' to elements that require it.

Text should be easy to read and understand to be accessible to users with cognitive disabilities and those who may struggle with complex language. Implementation includes using clear language and short sentences.

Simple and jargon-free language helps a wider audience understand technical content including non-native speakers and those with cognitive disabilities. Implementation involves avoiding complex words and providing clear definitions when necessary.

Responsive design ensures content is accessible and usable across a range of devices and screen sizes, benefiting users with different types of devices and those with low vision who need to zoom or enlarge text. Implement using flexible layouts and media queries.

Captions ensure that audio content is accessible to those who are deaf or hard of hearing by providing a text representation of the spoken content in videos. Implement through closed captioning or subtitles.

Ensuring compatibility with screen readers allows users who are blind or have low vision to perceive and interact with content. Implementation involves semantic HTML and ARIA roles to convey structure and interact with elements.

An accessible document structure with proper use of headings and lists enables users of screen readers to easily navigate and understand the document layout. Use correct semantic markup in HTML or styling features in word processors.

Keyboard navigation allows users with limited mobility or those who cannot use a mouse to navigate through content. Implement by ensuring tab order reflects the logical flow of information and all interactive elements are focusable.

Content should be presented in a logical order to be understandable and navigable, particularly for screen reader users or those with cognitive disabilities. Organize content in a meaningful sequence and employ proper markup to support it.

High color contrast between text and background improves readability for users with color vision deficiencies or low vision. Implement by following WCAG guidelines for contrast ratios.