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Some helpful tips and tricks on writing alt text from the World Wide Web Consortium (W3C)'s Web Accessibility Initiative (WAI).
A helpful article on how to write good alt text from the Nielsen Norman group (NNgroup).
A set of captioning guidelines from the WAI to help provide content to those who are Deaf and hard-of-hearing.
A free contrast checker application by Vispero to help optimize content for individuals who are colourblind or have low vision. Available for download on Windows and Mac.
A tool to calculate the contrast ratio of foreground and background colours.
Best practices for writing alt text from the Government of Canada.
A compilation of techniques for writing alt text from Web Accessibility in Mind (WebAIM).
A contrast grid to test multiple foreground and background colour combinations.
A free browser extension to check colour contrasts straight from your browser.
A tool offered by WebAIM to calculate the contrast ratio of foreground and background colours.