# html¶

The html extension gives you access to some HTML features like styles, classes, element ID’s, and clickable links. It defines the following non-standard macros:

\href{url}{math}

Makes math be a link to the page given by url. Note that the url is not processed by TeX, but is given as the literal url. In actual TeX or LaTeX, special characters must be escaped; so, for example, a url containing a # would need to use \# in the url in actual TeX. That is not necessary in MathJax, and if you do use \#, it will produce /# in the url (since the \ will be inserted into the url verbatim, and browsers will convert that to / (thinking it is a DOS directory separator).

\class{name}{math}

Attaches the CSS class name to the output associated with math when it is included in the HTML page. This allows your CSS to style the element.

\cssId{id}{math}

Attaches an id attribute with value id to the output associated with math when it is included in the HTML page. This allows your CSS to style the element, or your javascript to locate it on the page.

\style{css}{math}

Adds the give css declarations to the element associated with math.

For example:

x \href{why-equal.html}{=} y^2 + 1

(x+1)^2 = \class{hidden}{(x+1)(x+1)}

(x+1)^2 = \cssId{step1}{\style{visibility:hidden}{(x+1)(x+1)}}


Note

For the \href macro, the url parameter is not processed futher, as it is in actual TeX, so you do not need to quote special characters. For example, \href{#section1}{x} is fine, but \href{\#section}{x} will not work as expected.

This extension is loaded automatically when the autoload extension is used. To load the html extension explicitly, add '[tex]/html' to the load array of the loader block of your MathJax configuration, and add 'html' to the packages array of the tex block.

window.MathJax = {

Alternatively, use \require{html} in a TeX expression to load it dynamically from within the math on the page, if the require extension is loaded.