1) Choose fonts that make things easier to read
Verdana, Tahoma, Trebuchet MS and Georgia are font families developed specifically for reading content displayed on a computer screen. These sans-serif fonts make content most readable.
2) Align content to the left
Your copy should be aligned to the left. Don’t ever use justified text. Folks who have dyslexia will find your content difficult to read.
3) Pay attention to vertical line spacing
The vertical space between lines of type is called leading. Leading is measured from the baseline of one line of text to the baseline of the line above it.
Best Practice: Ensure that line spacing is at least half the height of the text, with paragraph spacing 1.5 times the height of text.
4) Set headings in ems or percentage (%) increments (not pixels) to separate content
Use font sizes in either ems or % increments. This gives users control over increasing or decreasing the text sizes in your email content. Headings need to be at least 22px (1.3750em or 137.50%) in order to separate them from 14px (0.875em or 87.5%) email copy.
WEBSITE ACCESSIBILITY TESTING & REMEDIATION SERVICES: Mary Gillen is an experienced Website Accessibility Compliance Auditor and Remediator. She can test your website to determine if it meets accessibility standards:
WCAG 2.1: 312 checkpoints covering A, AA and AAA W3 accessibility guidelines
Section 508: 15 US federal guidelines covered by 59 accessibility checkpoints