Adding a javascript script tag some place so that it works for every file in sphinx documentation

Question

I am using Sphinx to write some notes. I am using the Mathjax extension for Math in the notes. The default size of the math is little larger than I would like. On the Mathja

Answer 1

In Sphinx 3.0 and later, the easiest way to add short snippets of JavaScript configuration is to call app.add_js_file(None, body="...JS code...") in your conf.py setup function. Example:

# In your Sphinx project's conf.py:

# 1. Add whatever JS code you need as a string constant.
#    (This example is from the original question.)
MATHJAX_CONFIG_JS = """
MathJax.Hub.Config({
  "HTML-CSS": {scale: 90}
});
"""

# 2. Create a setup() function if you don't already have one.
#    (If you do, just add to your existing setup() function.)
def setup(app):
    # 3. Tell Sphinx to add your JS code. Sphinx will insert
    #    the `body` into the html inside a