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# Installing and Testing MathJax

MathJax can be loaded from a public web server or privately from your hard drive or other local media. To use MathJax in either way, you will need to obtain a copy of MathJax and its font package. There are two main ways to do this: via `svn` or via a pre-packaged archive. We recommend the former, as it is easier to keep your installation up to date using `svn`.

## Obtaining MathJax via SVN

The easiest way to get MathJax and keep it up to date is to use the subversion source control system, `svn`. Use the commands

    svn co http://mathjax.svn.sourceforge.net/svnroot/mathjax/trunk/mathjax mathjax
    cd mathjax
    unzip fonts.zip

to obtain and set up a copy of MathJax. (The SourceForge development page also shows how to do this.)

Whenever you want to update MathJax, you can now use

    cd mathjax
    svn status

to check if there are updates to MathJax. If MathJax needs updating, use

    cd mathjax
    svn update
    #  if fonts.zip is updated, do the following as well:
    rm -rf fonts
    unzip fonts.zip

to udpate your copy of MathJax to the current release version. If the `fonts.zip` file has been updated, you will need to remove the old fonts directory and unpack the new one bring your installation up to date. If you keep MathJax updated in this way, you will be sure that you have the latest bug fixes and new features as they become available.

This gets you the current development copy of MathJax, which is the “bleeding-edge” version that contains all the latest changes to MathJax. At times, however, these may be less stable than the “release” version. If you prefer to use the most stable version (that may not include all the latest patches and features), use

    svn co http://mathjax.svn.sourcesforge.net/svnroot/mathjax/tags/mathjax-1.0 mathajx
    cd mathjax
    unzip fonts.zip

to obtain the version 1.0 release. When you wish to update to a new release, you will need to check out a new copy of MathJax with the new release number.

## Obtaining MathJax via an archive

Release versions of MathJax are available in archive files from the MathJax download page or the SourceForge files page, where you can download the archives that you need.

You should download the `MathJax-v1.0.zip` file, then simply unzip it. Once the MathJax directory is unpacked, you should move it to the desired location on your server (or your hard disk, if you are using it locally rather then through a web server). One natural location is to put it at the top level of your web server’s hierarchy. That would let you refer to the main MathJax file as `/MathJax/MathJax.js` from within any page on your server.

## Testing your installation

Use the HTML files in the `test` directory to see if your installation is working properly:

    test/
        index.html          # Tests default configuration
        index-images.html   # Tests image-font fallback display
        sample.html         # Sample page with lots of pretty equations

Open these files in your browser to see that they appear to be working properly. If you have installed MathJax on a server, use the web address for those files rather than opening them locally. When you view the `index.html` file, you should see (after a few moments) a message that MathJax appears to be working. If not, you should check that the files have been transferred to the server completely, that the fonts archive has been unpacked in the correct location, and that the permissions allow the server to access the files and folders that are part of the MathJax directory (be sure to verify the MathJax folder’s permissions as well). Checking the server logs may help locate problems with the installation.

## Notes about shared installations

Typically, you want to have MathJax installed on the same server as your web pages that use MathJax. There are times, however, when that may be impractical, or when you want to use a MathJax installation at a different site. For example, a departmental server at `www.math.yourcollege.edu` might like to use a college-wide installation at `www.yourcollege.edu` rather than installing a separate copy on the departmental machine. MathJax can certainly be loaded from another server, but there is one imporant caveat — Firefox’s same-origin security policy for cross-domain scripting.

Firefox’s interpretation of the same-origin policy is more strict than most other browsers, and it affects how fonts are loaded with the @font-face CSS directive. MathJax uses this directory to load web-based math fonts into a page when the user doesn’t have them installed locally on their own computer. Firefox’s security policy, however, only allows this when the fonts come from the same server as the web page itself, so if you load MathJax (and hence its web fonts) from a different server, Firefox won’t be able to access those web fonts. In this case, MathJax will pause while waiting for the font to download (which will never happen) and will time out after about 15 seconds for each font it tries to access. Typically that is three or four fonts, so your Foirefox users will experience a minute or so delay before mathematics is displayed, and then it will probably display incorrectly because the browser doesn’t have access to the correct fonts.

There is a solution to this, however, if you manage the server where MathJax is installed, and if that server is running the Apache web server. In the remote server’s `MathJax/fonts/HTML-CSS/TeX/otf` folder, create a file called `.htaccess` that contains the following lines:

    <FilesMatch "\.(ttf|otf|eot)$">
    <IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "*"
    </IfModule>
    </FilesMatch>

and make sure the permissions allow the server to read this file. (The file’s name starts with a period, which causes it to be an “invisible” file on unix-based operating systems. Some systems, particularly graphic user interfaces, may not allow you to create such files, so you might need to use the command-line interface to accomplish this.)

This file should make it possible for pages at other sites to load MathJax from this server in such a way that Firefox will be able to download the web-based fonts. If you want to restrict the sites that can access the web fonts, change the `Access-Control-Allow-Origin` line to something like:

    Header set Access-Control-Allow-Origin "http://www.math.yourcollege.edu"

so that only pages at `www.math.yourcollege.edu` will be able to download the fonts from this site. See the open font library discussion of web-font linking for more details.

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