Release Notes > 12.0.0.0 > Updates in This Release > MathJax and Arbortext Layout Developer > Introduction
  
Introduction
MathML and TeX are two languages which provide the ability to describe and display mathematical equations. PTC Arbortext Layout Developer already provides support for TeX and also has a tag library for MathML, but the latter is outdated and incomplete.
MathJax (MathJax.org) provides a JavaScript display engine for mathematics which works within a browser by returning an SVG image. The MathJax project is supported by a number STEM publishers.
The 12.0.0.0 release of Arbortext Layout Developer provides a built-in add-on library which provides the MathJax library and a framework to use MathJax with Layout Developer in documents.
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In order to use the MathJax library, Layout Developer must be started with the ‘no strict JavaScript’ flag set to true. This is done using the -nostrictjs command-line option when starting Layout Developer.