Does it print as you expected in any other browser?

On Linux:
 - FF prints all columns through the system dialog, but only when "ignore scaling and fit to page" is checked on the Options tab.
 - Chrome prints all columns if you manually adjust the scale in the cloud print dialog. If you use the system dialog, there is no Options tab that would allow you to enable the "ignore scaling and fit to page" option that makes it work in FF.

On Win10:
 - FF prints all columns through the system dialog by default.
 - Chrome prints all columns if you manually adjust the scale in the cloud print dialog. If you use the system dialog, I couldn't find a "shrink to fit" option at all.
 - Edge prints 1 fewer column than Chrome, even when Edge's "Shrink to fit" is selected.

Changing OS-Chrome to OS-Windows. The bug was filed from CrOS but the screenshot is windows.

Oh, I used a cleaned-up reproduction case, http://jsfiddle.net/dgrogan/9DbEP/2888/ , which moves the @media print css rules to be universal.

In comment 3, I believe "cloud print dialog" refers to Print Preview.

If Blink provides a "fit to page" option, we could potentially plumb it through to Print Preview, so users can toggle it instead of having to manually set the scaling value.

> If Blink provides a "fit to page" option, we could potentially plumb it through to Print Preview

I'm not too familiar with the Print <-> Blink interface (+mstensho, who is more knowledgeable), but I'd have guessed Blink already exposes something that would let the embedder specify sizing constraints. Chrome tells Blink how wide the window is, for example. Could it also tell Blink how wide the paper is? The layout engine already knows when it has to paginate a document, so some of the relevant information is already getting through, but perhaps some is omitted or not getting honored?

mstensho, please correct anything I got wrong!

I think the PrintRenderFrameHelper already sends page size information to Blink via the canvas that is sent to WebLocalFrame::PrintPage. The relevant code is at: https://cs.chromium.org/chromium/src/components/printing/renderer/print_render_frame_helper.cc?l=1967-2000 and 
https://cs.chromium.org/chromium/src/components/printing/renderer/print_render_frame_helper.cc?l=648-658
The page size/content area parameters are from Print Preview.

Thanks for the pointer. (And indeed I think my "cloud print dialog" referred to what is more properly known as "Print Preview")

Could I get more detail about what the missing link is?

This flag is seemingly related?
https://cs.chromium.org/chromium/src/third_party/WebKit/public/web/WebPrintScalingOption.h?l=40

When printing, Chrome automatically scales down as necessary to fit wide content on the page, but only to a certain limit, so that the result doesn't become unreadably small.

The test has a table that's way too wide. To make it fit, I had to scale it down to 61%, and the font became really tiny.

I don't think there's anything we should change here, on our side. In any case, it has nothing to do with tables. You can achieve the same effect with a DIV with a large specified width, for instance.

Bug reporter: Does manually scaling work for you? As comment 10 said, we could potentially scale the table down even more to make it fit, but then the text will become unreadable.

Looking at the Edge browser behavior in comment 3, I suspect their shrink to fit optional also has a minimum size. At which point they won't scale down further because the text will be too small.

How we can scale it down manually? I have taken the print in Firefox 59.0.2 in portrait mode it automatically scales the table and showing the full table. But Yes font size is scaled down automatically looks tiny in size but its User's choice to print the same. I think chrome should do the same thing if number of columns are more without affecting the table structure it should print the same. As in lot of legacy applications people are using pure table structure to display the data it'll be very difficult to convert the tables in DIV structure.

I think comment 11 is referring to using the "Scale" field in the Print Preview dialog. Testing here, with portrait layout, default margins and Letter size paper the table fits if I scale to 60%.

The scaling control is hidden under "More Settings" in the Print Preview dialog on the left side.