sphinx-sticky-margin 1.1.1

A Sphinx extension that renders selected figures as sticky margin sidebars while scrolling.

Sphinx Sticky Margin

sphinx-sticky-margin is a Sphinx extension that adds a sticky margin copy for figures marked with the :class: sticky-margin option.

When the original figure scrolls above the header, a duplicate appears in the right margin (on wide screens). When the original figure comes back into view, the margin copy is hidden.

Installation

pip install sphinx-sticky-margin

Enable Extension

In conf.py:

extensions = [
    "sphinx_sticky_margin",
]

For Jupyter Book (_config.yml):

sphinx:
  extra_extensions:
    - sphinx_sticky_margin

Usage

Add the :class: sticky-margin class to figures that should get a sticky margin clone.

Insert a hide-sticky-margin directive to insert a marker after which to fade out the last sticky figure during scrolling.

The sticky margin figure will appear when the original figure scrolls out of view, and will disappear when the original figure comes back into view.

In case of multiple sticky margin figures, all will be shown in the margin.

If a hide marker scrolls out of view at the top when scrolling down, all sticky figures defined before that marker will be hidden.

When scrolling back up, the sticky margin figures above a hide marker (but after any previous hide marker) will reappear when that hide marker scrolls back below the header.

MyST Example

```{figure} path/to/image.png
:class: sticky-margin

Figure caption.
```

reStructuredText Example

.. figure:: path/to/image.png
   :class: sticky-margin

   Figure caption.

Hide Marker (MyST)

```{hide-sticky-margin}
```

When the marker scrolls above the header, the previous sticky margin figure is hidden with a fade-out.

Notes

• The sticky margin display is active from 1200px viewport width and up.
• The extension injects sticky-margin.css and sticky-margin.js.
• MathJax content inside sticky figures is re-typeset when needed.
• The extension removes explicit line endings (<br>, double space in markdown) from figure captions to prevent layout issues in the margin.