The page shown at www.bjordan.org.uk/test/index.html has started throwing up a "NetSurf is running out of memory" error since at least NetSurf 3.0 (Dev CI#471) and up to 492.
In fairness the file is a data file named as .html and RISC OS file typed as HTML; it is prepared for use in a program which later adds it to a template file to produce a valid page. The file contains valid HTML and for many years I have been able to open it in NetSurf as part of the editing process. It opens as expected in NetSurf 2.9 and in the main Windows browsers and is available in a .zip file at www.bjordan.org.uk/test/test.zip -- Brian Jordan Virtual RPC-AdjustSA RISC OS 6.20