From 1ff00b10c3f94578852650633d9ce238561ecb36 Mon Sep 17 00:00:00 2001
From: rocky <rb@dustyfeet.com>
Date: Mon, 29 Mar 2021 05:27:57 -0400
Subject: [PATCH] mglyph -> mtext broke some images

---
 mathics/builtin/graphics.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/mathics/builtin/graphics.py b/mathics/builtin/graphics.py
index c07f60794b..24245a1c82 100644
--- a/mathics/builtin/graphics.py
+++ b/mathics/builtin/graphics.py
@@ -3226,14 +3226,15 @@ def boxes_to_xml(self, leaves=None, **options):
             svg,
         )
 
-        return (
-            '<mtext><img width="%dpx" height="%dpx" src="data:image/svg+xml;base64,%s"/></mtext>'
-            % (
+        # mglyph, which is what we have been using, is bad because MathML standard changed.
+        # metext does not work beacause the way in which we produce the svg images is also based on this outdated mglyph behaviour.
+        # format = "<mtext><img width="%dpx" height="%dpx" src="data:image/svg+xml;base64,%s"/></mtext>"
+        template = '<mglyph width="%dpx" height="%dpx" src="data:image/svg+xml;base64,%s"/>'
+        return template % (
                 int(width),
                 int(height),
                 base64.b64encode(svg_xml.encode("utf8")).decode("utf8"),
             )
-        )
 
     def axis_ticks(self, xmin, xmax):
         def round_to_zero(value):