We are trying to use the best technologies available to make the DLMF content as useful and accessible as we can. Although we have attempted to follow stanadards and maintain backwards compatibility with older browsers, you will generally get the best results by upgrading to the latest version of your preferred browser.
One important technology is MathML (See About MathML), for representing mathematics on the web. Since not all browsers support it, we try to send XML and MathML only to those browsers that do, and use images for the math in other browsers. It is quite possible that we are not correctly recognizing your browser. If we have sent MathML to a browser that doesn’t support it, the result is likely to be unreadable. Less disastrous, but still disappointing, is the case where a MathML supporting browser has been sent images for the math, instead of MathML.
If we have incorrectly detected your browser, you can force a selection of Document Format in Customize DLMF (along with other preferences). We would also appreciate knowing about it, so we can improve our algorithm: Please contact us with information about the browser, its version and the operating system you use.