My Firefox does as well.
Anyway, it seems to just work by drawing over it:
<details><summary>Sample Python code</summary>
```python
import math
import gi
gi.require_version('Gtk', '3.0') # noqa
from gi.repository import Gtk
# Interesting piece
class MyScrollbar(Gtk.Scrollbar):
def do_draw(self, cr):
Gtk.Scrollbar.do_draw(self, cr)
alloc = self.get_allocation()
cr.set_line_width(1)
cr.set_source_rgba(1, 0, 1, 0.5)
for mark in (0.05, 0.2, 0.5, 0.55, 0.8, 0.9):
cr.move_to(math.floor(alloc.width * mark) + 0.5, 0)
cr.line_to(math.floor(alloc.width * mark) + 0.5, alloc.height)
cr.stroke()
# Boilerplate follows
class Window(Gtk.ApplicationWindow):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.scroll = MyScrollbar(visible=True)
self.add(self.scroll)
class App(Gtk.Application):
def __init__(self, *args, application_id='test.ScrollIndicTest', **kwargs):
super().__init__(*args, application_id=application_id, **kwargs)
def do_activate(self):
window = self.get_active_window()
if not window:
window = Window(application=self, default_width=600)
window.present()
if __name__ == '__main__':
App().run()
```
</details>
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