Fix \pmb (#1924)

* Fix \pmb

* Update screenshots

* Use \mathbf for MathML

src/macros.js

@@ -662,13 +662,12 @@ defineMacro("\\mod", "\\allowbreak" +
     "{\\rm mod}\\,\\,#1");
 
 // \pmb    --   A simulation of bold.
-// It works by typesetting three copies of the argument with small offsets.
-// Ref: a rather lengthy macro in ambsy.sty
-defineMacro("\\pmb", "\\html@mathml{\\@binrel{#1}{" +
-    "\\mathrlap{#1}" +
-    "\\mathrlap{\\mkern0.4mu\\raisebox{0.4mu}{$#1$}}" +
-    "{\\mkern0.8mu#1}" +
-    "}}{\\mathbf{#1}}");
+// The version in ambsy.sty works by typesetting three copies of the argument
+// with small offsets. We use two copies. We omit the vertical offset because
+// of rendering problems that makeVList encounters in Safari.
+defineMacro("\\pmb", "\\html@mathml{" +
+    "\\@binrel{#1}{\\mathrlap{#1}\\kern0.5px#1}}" +
+    "{\\mathbf{#1}}");
 
 //////////////////////////////////////////////////////////////////////
 // LaTeX source2e