Fix mathjax does not have time to create formula

sphinx_pyppeteer_builder/__init__.py

@@ -5,6 +5,7 @@ from copy import deepcopy
 from .pyppeteer_builder import PyppeteerPDFBuilder
 from typing import Dict, Any
 from sphinx.application import Sphinx
+from sphinx.config import Config
 from sphinx.util.osutil import make_filename
 
 import pkg_resources
@@ -29,11 +30,12 @@ DEFAULT_PYPPETEER_ARGS = [
     ]
 
 
-def on_config_inited(app, config):
+def on_config_inited(app, config: Config):
     """ Change config on the fly """
     pdf_options = deepcopy(DEFAULT_PDF_OPTIONS)
     pdf_options.update(app.config.pyppeteer_pdf_options)
     app.config.pyppeteer_pdf_options = pdf_options
+    app.set_html_assets_policy("always")
 
 
 def setup(app: Sphinx) -> Dict[str, Any]:
@@ -118,6 +120,11 @@ def setup(app: Sphinx) -> Dict[str, Any]:
         '',
         'pyppeteer'
     )
+    app.add_config_value(
+        'pyppeteer_baseurl',
+        '#',
+        'pyppeteer'
+    )
 
     return {
         'version': __version__,

sphinx_pyppeteer_builder/pyppeteer_builder.py

@@ -105,7 +105,7 @@ class PyppeteerPDFBuilder(SingleFileHTMLBuilder):
         })
         try:
             page = await browser.newPage()
-            await page.goto(url)
+            await page.goto(url, {"waitUntil": ["networkidle2"]})
             await page.pdf(pdf_options)
             await browser.close()
         finally: