This to test the inclusion of unusual image files in a post. But this one a regular PNG.
This one a regular JPG.
This one a GIF file.
This one a WEBP file.
This one, an AVIF file, would not load, although it is easy enough to convert to a JPG with the Snipping Tool, presumably with some loss of resolution. Maybe the answer is that you can load the files that appear by default in the 'Insert Image' dialogue, the ones described as 'Custom' bottom right. Anything else will not load.
This one, a BMP file. No idea now why it is in this particular format, for which see reference 1.
This one, a Microsoft Edge HTML document, would not load.
A map of Kew gardens, described as an Acrobat file in File Explorer, would not load as an image.
An Acrobat document of the ordinary sort would not load as an image.
A document described as a PRN file, generated by print to file, would not load as an image. Indeed, I failed to open it as anything sensible at all.
Bottom line seems to be regular image files only, which is not unreasonable.
Not got to the bottom of what click to enlarge does, which seems to be a bit unpredictable. Maybe image files include something about preferred display size. Presumably most image files are (more or less) organised as arrays of pixels which can be mapped in a natural way onto the pixels of the target screen, which may or may not be big enough. What happens then?
The BMP file above, for example, clicks to occupy the whole width of the screen on my laptop, while the GIF file only occupies the middle of the screen.
PS 1: the print file which would not load came from printing a small Powerpoint document. I had also tried printing to Acrobat (PDF), an option which was offered during the Powerpoint print dialogue, which I was told would work on a sample basis, after which I had to pay Adobe something, but that just hung. I did not pursue the matter.
PS 2: this blog is not open for business. The blog which is currently open is to be found at reference 2.
References
Reference 1: https://en.wikipedia.org/wiki/BMP_file_format.
Reference 2: https://psmv5.blogspot.com/.
