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HTML code standards
Code style standards for HTML

This document outlines the rules for writing HTML documents and fragments across all of our codebases.

General rules

We write HTML5 markup, following XHTML standards for readability. General rules for all HTML documents are:

  • HTML documents should use HTML5 doctype - <!DOCTYPE html>
  • Indent using 2 spaces
  • Tags and attributes should be lowercase (<p class="intro"> not <P CLASS="intro")
  • Use double quotes for attribute values
  • Close all elements - either a closeing tag (<p>...</p>) or self-closing (<img src="jeff.jpg" />)

Images

  • Use alt attributes on img elements
  • Use null alt text (alt="") and no title attribute on img elements for images that Assistive Technology should ignore