XSLT removal will break multiple government and regulatory sites

Summary

What is the issue with the HTML Standard? One of the issues we've seen in #11523 and #11563 is that the proposal to remove XSLT from the spec doesn't acknowledge existing use cases beyond Chrome Status counter stats. According to Chrome's own Blink principles of web compatibility: The primary signal we use is the fraction of page views impacted in Chrome, usually computed via Blink’s UseCounter UMA metrics. As a general rule of thumb, 0.1% of PageVisits (1 in 1000) is large, while 0.001% is considered small but non-trivial. Anything below about 0.00001% (1 in 10 million) is generally considered trivial. There are around 771 billion web pages viewed in Chrome every month (not counting other Chromium-based browsers). So seriously breaking even 0.0001% still results in someone being frustrated every 3 seconds, and so not to be taken lightly! To add to the use cases already provided in the discussions above, here's a small list: Name Description Link United States Congress Legislative texts are shown using XSLT https://www.congress.gov/117/bills/hr3617/BILLS-117hr3617ih.xml and https://www.govinfo.gov/content/pkg/BILLS-119hr400ih/xml/BILLS-119hr400ih.xml National Weather Service Current Observations Uses client-side XSLT to transform and display current weather observation data from XML. https://www.weather.gov/xml/current_obs/KABE.xml European Parliament Political Parties Uses client-side XSLT to transform and display information on European political parties from XML. https://www.europarl.europa.eu/politicalparties/index_en.xml Therapeutic Goods Administration Code Definitions Uses client-side XSLT to transform and display regulatory code definitions from XML. https://apps.tga.gov.au/downloads/sequence-description.xml Canadian Forest Service Weather Stations Metadata Uses client-side XSLT to transform and display weather station metadata from XML. https://cwfis.cfs.nrcan.gc.ca/downloads/fwi_obs/WeatherStations_CWFIS_export.xml European Pollutant Release and Transfer R...