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I would like to know if Consolas and Arial are 100% sure to be supported on website by any browsers/operation system; without that I need to use CSS3 for including font exclusively. I have been Googling that stuff, but I found only report of how big percentage of websites use them. But I don't know if there are any exceptions where font-family: "Consolas", "Arial"; wouldn't be understand by system or browser.

I quite realise it sounds like dumpy-@@@ question but this would actually could change ways how I can code website. It sounds even more stupid than sense of asking of resolve.

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No desktop font is truly guaranteed on every browser and operating system. Consolas is distributed with modern Windows builds and some Microsoft products, while Arial is common on Windows and macOS but can be missing on many Linux installs; browsers will only use fonts that are installed locally or that you deliver to them (Windows 10 font list, Arial — Wikipedia).

If exact rendering matters, deliver the font to clients with @font-face (self‑host or use a font service) so every browser gets the same files. Use modern formats (WOFF/WOFF2) and a font-display strategy to avoid layout jank. Check browser support and fallbacks before committing, and remember that embedding proprietary system fonts can require a license — prefer open-license web fonts or properly licensed delivery (@font-face — MDN, WOFF2 support — caniuse.com).

Practical checklist: build a sensible fallback stack ending in the generic family, test on target OSes (Windows/macOS/Linux/Android/iOS), and if you need a consistent monospaced look outside Windows pick an open alternative or embed a mono webfont (Menlo/Monaco/DejaVu/Liberation or a Google font). As noted, substitution lists are useful, but testing and proper delivery are the reliable ways to guarantee appearance.

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