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# Browser Bugs
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Browsers have several issues related to rendering of mathematical expressions
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or other features provided by MathJax. The most obvious one is the lack of a
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good [MathML support](MathML-Support-In-Browsers.md) but there are many other
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problems that MathJax tries to fix. However, adding specific workaround to each
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of the browser issue makes the MathJax code more complex and sometimes it may
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even not be possible to write such a workaround. Ideally all these bugs should
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be fixed upstream.
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This page lists some bugs that the MathJax team found in browsers as well as
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the corresponding report entries. The main goal is to keep track of these
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issues so that we can eventually remove them once the bugs are fixed in the
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browsers. This can also help us to answer questions about possible bugs on the
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MathJax user mailing list. Finally, this may also be an interesting resource for
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browser vendors and users.
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## Internet Explorer
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* <del>Entity definitions for characters are not up-to-date. See
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[feedback 674766](https://connect.microsoft.com/IE/feedback/details/674766/)
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</del> (Fixed in Internet Explorer 10).
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## Firefox
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[MathJax Tracking Bug](https://bugzilla.mozilla.org/show_bug.cgi?id=745687)
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* Firefox rendering problems following full-width math
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See [issue 231](https://github.com/mathjax/MathJax/issues/231)
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* printing pages with downloadable fonts doesn't render all fonts on the page
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See [bug 468568](https://bugzilla.mozilla.org/show_bug.cgi?id=468568)
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* [MathML bugs](https://bugzilla.mozilla.org/show_bug.cgi?id=687809)
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* Support for the 'mathvariant' attribute
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See [bug 114365](https://bugzilla.mozilla.org/show_bug.cgi?id=114365)
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* Allow downloading math fonts / bundle math fonts with Firefox for better
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MathML experience.
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See [bug 295193](https://bugzilla.mozilla.org/show_bug.cgi?id=295193).
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* Add support for mtable@rowspacing/columnspacing attributes
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See [bug 330964](https://bugzilla.mozilla.org/show_bug.cgi?id=330964).
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* rendering of mtable with a columnalign attribute is sometimes incorrect.
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See [bug 491384](https://bugzilla.mozilla.org/show_bug.cgi?id=491384).
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* Improve MathML linebreaking.
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See [bug 534962](https://bugzilla.mozilla.org/show_bug.cgi?id=534962).
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* Improve/Complete implementation of maction.
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See [bug 544036](https://bugzilla.mozilla.org/show_bug.cgi?id=544036).
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Note: MathJax supports maction but is such an element generated by an input
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processor other than MathML?
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* mpadded: height/depth should apply to logical metrics.
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See [bug 685628](https://bugzilla.mozilla.org/show_bug.cgi?id=685628).
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* Base of munderover not stretched.
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See [bug 687807](https://bugzilla.mozilla.org/show_bug.cgi?id=687807).
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* Add support for mlabeledtr.
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See [bug 689641](https://bugzilla.mozilla.org/show_bug.cgi?id=689641).
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* Problems printing MathML when @font-face is used.
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See [issue 137](https://github.com/mathjax/MathJax/issues/137) and
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[bug 697053](https://bugzilla.mozilla.org/show_bug.cgi?id=697053).
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* <del>too much space between upright mi elements.
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[bug 320294](https://bugzilla.mozilla.org/show_bug.cgi?id=320294)</del>
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(fixed in Firefox 13).
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* <del>mlabeledtr is not shown at all. See
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[bug 356870](https://bugzilla.mozilla.org/show_bug.cgi?id=356870)</del>
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(fixed in Firefox 9).
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MathJax workaround: remove the label and convert mlabeledtr to mtr.
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(removed in MathJax 2.0)
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* <del>mpadded: add support for the voffset attribute. See
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[bug 557474](https://bugzilla.mozilla.org/show_bug.cgi?id=557474)</del>
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(fixed in Firefox 7).
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* <del>Names for negative spaces are not supported. See
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[bug 650530](https://bugzilla.mozilla.org/show_bug.cgi?id=650530)</del>
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(fixed in Firefox 7).
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* <del>Support for attribute "width" on mtable. See
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[bug 722880](https://bugzilla.mozilla.org/show_bug.cgi?id=722880)</del>
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(fixed in Firefox 13).
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MathJax workaround: attach a "style" attribute to the mtable element.
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See [issue 214](https://github.com/mathjax/MathJax/issues/214)
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## Webkit
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[MathJax Tracking Bug](https://bugs.webkit.org/show_bug.cgi?id=84012)
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* Safari/Chrome: ⋹̸ and ⋵̸ are not supported.
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See [bug 62187](https://bugs.webkit.org/show_bug.cgi?id=62187) and
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[bug 43949](https://bugs.webkit.org/show_bug.cgi?id=43949#c39). Not tested
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with Konqueror yet.
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* Chrome 18 messes up the Show As window
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See [issue 221](https://github.com/mathjax/MathJax/issues/221)
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* -webkit-column-count crashes Mathjax in Chrome
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See [issue 45](https://github.com/mathjax/MathJax/issues/45) and
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* Positioning error in dynamically inserted content
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See [bug 50210](https://bugs.webkit.org/show_bug.cgi?id=50210)
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## Opera
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* ⟨ and ⟩ are not mapped to the right unicode characters. Bug report
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ID is DSK-343994.
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