This shows which entities convert to the greater than character inside a iframe srcdoc. Inspired by: https://x.com/therceman/status/1803666353892585642
<iframe srcdoc="$[data1]" id=x></iframe>if(x.srcdoc.includes(">"))log('$[data1]')<iframe srcdoc=">" id=x></iframe><iframe srcdoc=">" id=x></iframe><iframe srcdoc=">⃒" id=x></iframe>