bar from scratch VERSION v1.4

README.md

@@ -69,10 +69,13 @@ from the folder name). Reload the board; no build step, no configuration.
 Kanboard's board scrolls horizontally inside `#board-container`, so its only horizontal
 scrollbar is at the very bottom of the board -- on a wide board you must scroll all the
 way down to move sideways. Enable "Add a top horizontal scrollbar" in the settings to get
-a second, mirrored scrollbar just above the columns. A small script
-(`Asset/js/top-scrollbar.js`, loaded only when the option is on) inserts a dummy scroll
-strip above `#board-container` and keeps its scroll position in sync with the board both
-ways.
+a second scrollbar just above the columns.
+
+It is a custom track + draggable thumb (`Asset/js/top-scrollbar.js`, loaded only when the
+option is on), not a native scrollbar, so it renders and can be sized the same in every
+browser (Chrome, Firefox, Safari) and on touch. Drag the thumb or click the track to move
+the board; the thumb tracks the board when you scroll it by other means. Its thickness
+follows the "Top Horizontal Scrollbar thickness" setting.
 
 ## Settings
 
@@ -83,8 +86,8 @@ These settings are global (per Kanboard instance) and admin-only. Go to
   in the page head as the `--sv-shrink-offset` CSS variable. Increase it if the scrollbar
   is still clipped (for example with a taller theme header); decrease it to make the
   collapsed columns taller. Default: 240.
-- **Top Horizontal Scrollbar thickness in pixels** -- thickness of the top scrollbar
-  (Chromium/WebKit only). Injected as the `--sv-bar-size` CSS variable. Default: 25.
+- **Top Horizontal Scrollbar thickness in pixels** -- thickness of the custom top
+  scrollbar (all browsers). Injected as the `--sv-bar-size` CSS variable. Default: 25.
 - **Add a top horizontal scrollbar to the board** -- toggles the mirrored top scrollbar
   described above. Default: on.