https://www.w3schools.com/jsrEF/event_transition_elapsedtime.asp
TransitionEvent elapsedTime Property
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
property
https://docs.libreoffice.org/canvas/html/elapsedtime_8hxx.html
LibreOffice Module canvas (master): elapsedtime.hxx File Reference
libreofficemodulecanvasmasterhxx
https://docs.libreoffice.org/canvas/html/classcanvas_1_1tools_1_1ElapsedTime.html
LibreOffice Module canvas (master): canvas::tools::ElapsedTime Class Reference
master toolslibreofficemodulecanvasclass