Definition
Screen reader testing is the process of loading an email into screen reader software — such as VoiceOver on Mac, NVDA on Windows or TalkBack on Android — and verifying that the content is read in a logical order, all images have descriptive alt text, interactive elements are reachable via keyboard and the email's core message is communicated without visual cues.
Many email accessibility issues are invisible in a visual preview but immediately apparent to a screen reader user. Headings that are styled to look like headings but are not marked up as <h1> or <h2> elements, images without alt attributes that contain critical information and links labelled "click here" all create a confusing or unusable experience for screen reader users.
What to Test
- Reading order: does the screen reader announce content in the intended sequence?
- Heading hierarchy: are heading levels logical and informative?
- Image alt text: do all content images have meaningful descriptions?
- Link purpose: does each link label clearly describe its destination?
- Interactive elements: can all buttons and form fields be accessed via keyboard?
Best Practices
- Include screen reader testing in your pre-send QA checklist alongside visual rendering tests
- Test with at least two screen readers across different platforms — behaviour varies significantly between tools
- Do not rely on visual inspection to catch accessibility issues; screen reader testing reveals problems no visual review can
- Document accessibility findings and share them with the design team to prevent recurring issues
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