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[CommonHTML] Inconsistent horizontal spacing when loading a new font

Created by: SuzanneSoy

In the example below, the spacing between the :: and the = is not the same on the first and fifth equations (it's more visible on the fifth). These equations load a new font, which might be the cause for the larger space. The equations 1–4 are strictly identical, and so are the equations 5–8. I wasn't able to build a smaller example, the problem disappears when removing one of the : or when removing the \raise.

The space between the :: and the = is a bit wider on the first line, and much wider on the fifth line

<!DOCTYPE html>
<html>
  <head>
    <script type="text/x-mathjax-config">
      MathJax.Hub.Config({
        extensions:["tex2jax.js"],
        tex2jax:{displayMath:[["\\[", "\\]"]]},
        jax: ["input/TeX", "output/CommonHTML"]
      });
    </script>
    <script type="text/javascript" src="MathJax/MathJax.js?config=default"></script>
  </head>
  <body>
    <!-- Loads bf font: -->
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathbf{\unicode{x03BB}}\]
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathbf{\unicode{x03BB}}\]
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathbf{\unicode{x03BB}}\]
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathbf{\unicode{x03BB}}\]
    <!-- Loads sf font: -->
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathsf{\unicode{x03BB}}\]
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathsf{\unicode{x03BB}}\]
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathsf{\unicode{x03BB}}\]
    \[a \raise0.4mu{::}\hspace{-8mu}=\mathsf{\unicode{x03BB}}\]
  </body>
</html>