# “\right\rceil” sized incorrectly (in Firefox 50 on Mac OS X, maybe elsewhere)

In a comment to an answer I wrote, I noticed the following problem with the size of \right\rceil: $$n=\left\lceil e^{W\left(\frac{\log \left(\frac{n!}{\sqrt{2\pi}}\right)}{e}\right)+1}-\frac{1}{2}\right\rceil$$ changing the \rceil to ] gives the proper sizing: $$n=\left\lceil e^{W\left(\frac{\log \left(\frac{n!}{\sqrt{2\pi}}\right)}{e}\right)+1}-\frac{1}{2}\right]$$ Note: I just noticed that this does not show on my iPhone, so I am posting a picture of what I see:

I am running Mac OS X 10.11.5 and using Firefox 50.1.0.

As MartinR comments, if I change the renderer from "HTML-CSS" to "Common HTML", things render okay.

• Strange. My laptop (Windows 7, Firefox ?) shows it correctly. – Jyrki Lahtonen Jan 2 '17 at 7:36
• Can reproduce with Safari on macOS 10.12.2. Setting the "Math Renderer" to "Common HTML" instead of "HTML-CSS" makes it display correctly. – Martin R Jan 2 '17 at 7:44
• @MartinR: Indeed, setting the renderer to "Common HTML" fixes it for me, too. – robjohn Jan 2 '17 at 8:18

It turns out that there is a typo in the data file for local STIX fonts for the HTML-CSS output. This typo causes \rceil not to be able to stretch past the size of the largest single-glyph version in the font (i.e., the data for the multi-character stretchy version is effectively missing). The easiest solution, as already pointed out, is to switch the renderer, since this only affects the HTML-CSS output (and only with local STIX fonts). Alternative solutions would include switching to one of the other fonts available to MathJax (if you want to do that, I can tell you how), or installing the MathJax fonts locally, since they are used in preference to STIX, when available.