Accessibility
Background
Keep in mind that audience of your website can be also people with disabilities. When writing your code remember to use accessibility rules defined by WCAG.
Here are some handful articles about accessiblity in web:
Rules
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Use ARIA attributes for defining content of the element
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Mind document structure - especially proper heading outline
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Use dev tools to check for accessibility issues - Chrome’s Audit Panel
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Use alt attribute to provide text back-up for figures