Accessibility
What the site does for people with visual or motor impairments, which contrast ratios we have measured, and what we have not tested. The page is there so that a reader can tell in advance what will be convenient and what will not.
What already works
Display settings open from the “Low-vision version” link in the footer of any page. They are remembered by the browser and apply across the site, not to a single page.
- the “skip to content” link comes first in the markup — it is visible as soon as you tab through the page;
- three font sizes: the whole page scales, together with headings, captions and tables;
- four colour schemes: default, black on white, white on black, dark brown on beige;
- images can be switched off — text captions remain where the frames were;
- the mode is left by Esc or the reset button; the choice is stored in the browser.
What is done in the markup and the code
The panel is only the visible part. The rest works on every page, even if a reader never opens it:
- headings follow their levels; sections of long pages have anchors, and the table of contents is built from those headings;
- images have text descriptions, and decorative icons are hidden from screen readers;
- the expandable blocks are native browser elements: they work from the keyboard and without scripts;
- animation is switched off by the system “reduce motion” setting;
- keyboard focus is visible, and fields and buttons have labels.
Contrast: what has been measured
We measured contrast with the WCAG 2.1 formula — the ratio of the relative luminances of background and text. The threshold is 4.5:1 for normal text and 3:1 for large text and graphics. Here is what the four schemes came out at:
- default scheme: body text 16.5:1, muted text from 5.2 to 5.5:1 depending on the background;
- black on white: text 21:1, links 10.2:1;
- white on black: text 21:1, links 16.5:1;
- dark brown on beige: text 11.8:1, links 7.5:1.
One colour fell below the threshold — the decorative brass #b8862b on white, at 3.2:1. So it stays on rules, large numerals and icons, while small text uses the darker shade #7d5a1c, which measures 6.3:1.
What is missing and what has not been tested
There is no conformity certification under GOST R 52872-2019. The panel follows the standard, but no independent audit has been carried out — and we do not claim one.
We have not tested with real screen-reader users. Our checking is based on markup and measurement, not on the experience of a person who reads the site by ear. That is a limitation, and saying so plainly is more honest than keeping quiet.
There are almost no machine-readable documents on the site: only the CSV exports. We publish no PDFs; price information and customer materials are pages, not files. So there are no inaccessible documents among them.
If something cannot be read
Write to info@isai.su and describe the page and what gets in the way: scaling, contrast, keyboard operation, screen-reader output. Such messages are handled first.
If it is easier, add the browser and its version, the device, and what you expected to see. That is enough to reproduce the problem and fix it.