Overview

This PR fixes the accessibility violation reported in the issue where images were missing alternative text, which is required for WCAG 2.1 compliance and screen reader accessibility.

What Was Fixed

The specific axe violation flagged was:

<img src="https://github.com/polca/premise/raw/master/docs/large.png" height="300" style="max-width: 100%; height: auto; max-height: 300px;">

This image, along with all other images in the documentation, now has descriptive alternative text.

Changes Made

README.md

• Added alt="premise logo" to the main logo image (the specific violation)
• Added descriptive alt text to all badge images (PyPI, conda-forge, GitHub Actions, Coveralls, Documentation)

Documentation Files (RST)

• docs/index.rst: Added :alt: premise logo to the logo image
• docs/load.rst: Added descriptive alt text to all 5 OpenLCA interface screenshots
• docs/transform.rst: Added descriptive alt text to all 6 IAM region map images
• docs/introduction.rst: Added descriptive alt text to 3 diagrams (workflow and comparison plots)

Accessibility Compliance

✅ All images now include alternative text that describes their content or purpose
✅ Meets WCAG 2.1 Level A and AA success criteria for non-text content (1.1.1)
✅ No new accessibility issues introduced
✅ Total of 20 images fixed across all documentation

Testing

Verified that:

• All <img> tags in markdown files have alt attributes
• All .. image:: directives in RST files have :alt: options
• Alt text is descriptive and provides meaningful information about each image

Fixes accessibility issue with images missing alternative text.

Fixes #240

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