Accessibility

Published 27 September 2026

SALSA is run by Onsala Space Observatory, hosted by Chalmers University of Technology. We want as many people as possible to be able to use it. This page describes how SALSA meets the Swedish law on accessibility to digital public services, the known problems, and how to report problems to us.

How accessible is SALSA?

SALSA partially meets the Web Content Accessibility Guidelines (WCAG) 2.1 at level AA, because of the problems listed below. Pages can be used with a keyboard, including booking a telescope and opening your observations, and all text meets the contrast requirements.

Known problems

  • Spectrum charts on the observe and archive pages are drawn graphics, so a screen reader cannot read the data in them. The same data can be downloaded from the Observation archive as CSV or FITS files.
  • The chart analysis tools (zooming, picking baseline ranges and peaks for Gaussian fits) need a mouse or touch screen. Making them fully usable with a keyboard would be a disproportionate burden for a small educational service; the downloaded data can be analysed in any tool instead.
  • Webcam images and the sky map on the observe and live pages are visual only. The telescope's position is also shown as text.
  • Testing so far has been automated checks and keyboard testing. SALSA has not yet been tested with a screen reader, so there may be problems we do not know about.

Report a problem

If you find something on SALSA that you cannot use, or that you think does not meet the law, email salsa.onsala@gmail.com. Tell us which page it is and what the problem is, and we will do our best to fix it or find another way for you to get the information.

Supervision

The Agency for Digital Government (DIGG) supervises the law on accessibility to digital public services. If you are not satisfied with how we handle your report, you can report it to DIGG.

How we tested

We assessed SALSA ourselves in September 2026: an automated check (axe-core, WCAG 2.1 A and AA rules) of the main pages, and manual keyboard testing of booking and the archive.