One does not usually post TIFFs for the reason Slobodan noted, but here is a test with a 1.5 MB image. It is uncompressed TIFF in sRGB. On attempting to veiw the image, it is downloaded rather than displayed, so I would definitely not attach a TIFF.
That's correct, and according to the World Wide Web Consortium (W3C.org), images can be static bitmaps (e.g. PNGs, GIFs, JPEGs), single-page vector documents (single-page PDFs, XML files with an SVG root element), animated bitmaps (APNGs, animated GIFs), animated vector graphics (XML files with an SVG root element that use declarative SMIL animation), and so forth.
TIFFs are not considered to always be static bitmaps, and (depending on the browser) will be interpreted as files instead, for downloading instead of displaying. For some specific browsers on Windows, there is a plugin
available that allows to display TIFFs, but in general TIFFs are not used for browser display.