upgrade MathJax in html template from v2 to v3

Author: emilykl

plotly/io/_html.py

@@ -280,12 +280,14 @@ def to_html(
         include_mathjax = include_mathjax.lower()
 
     mathjax_template = """\
-    <script src="{url}?config=TeX-AMS-MML_SVG"></script>"""
+    <script src="{url}"></script>"""
 
     if include_mathjax == "cdn":
         mathjax_script = (
             mathjax_template.format(
-                url=("https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js")
+                url=(
+                    "https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-svg.min.js"
+                )
             )
             + _mathjax_config
         )

plotly/offline/offline.py

@@ -100,7 +100,7 @@ def _build_resize_script(plotdivid, plotly_root="Plotly"):
 
 
 def _build_mathjax_script(url):
-    return '<script src="{url}?config=TeX-AMS-MML_SVG"></script>'.format(url=url)
+    return '<script src="{url}"></script>'.format(url=url)
 
 
 def _get_jconfig(config=None):

tests/test_core/test_offline/test_offline.py

@@ -45,13 +45,9 @@
 directory_script = '<script charset="utf-8" src="plotly.min.js"></script>'
 
 
-mathjax_cdn = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js"
+mathjax_cdn = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-svg.min.js"
 
-mathjax_config_str = "?config=TeX-AMS-MML_SVG"
-
-mathjax_cdn_script = '<script src="{cdn}{config}"></script>'.format(
-    cdn=mathjax_cdn, config=mathjax_config_str
-)
+mathjax_cdn_script = f'<script src="{mathjax_cdn}"></script>'
 
 mathjax_font = "STIX-Web"
 
@@ -369,7 +365,7 @@ def test_include_mathjax_path_html(self):
         self.assertIn(plotly_config_script, html)
         self.assertIn(PLOTLYJS, html)
         self.assertNotIn(mathjax_cdn_script, html)
-        self.assertIn(other_cdn + mathjax_config_str, html)
+        self.assertIn(other_cdn, html)
         self.assertIn(mathjax_font, html)
 
     def test_include_mathjax_path_div(self):
@@ -379,7 +375,7 @@ def test_include_mathjax_path_div(self):
         self.assertIn(plotly_config_script, html)
         self.assertIn(PLOTLYJS, html)
         self.assertNotIn(mathjax_cdn_script, html)
-        self.assertIn(other_cdn + mathjax_config_str, html)
+        self.assertIn(other_cdn, html)
         self.assertIn(mathjax_font, html)
 
     def test_auto_play(self):