NEW126591
vw units don't look at the right viewport in print media 
https://bugs.webkit.org/show_bug.cgi?id=126591
Summary vw units don't look at the right viewport in print media
Brad
Reported 2014-01-07 12:56:51 PST
VW units are supposed to be based on the width of the initial containing block (which is divided into 100 VW units). But when printed, the ICB is the page area (the printable area of the piece of paper). Webkit seems to be using the width of the window on the monitor instead as its reference for print VWs. What's more, it does this even when the page is inside an iframe: it uses the width of the outer window instead of the width of the iframe. 1VW should instead be 1/100 of the print area of the page.
Attachments
Patch (9.38 KB, patch)
2014-07-06 21:10 PDT, Benjamin Poulain 		no flags
DetailsFormatted DiffDiff
Safari Technology Preview 152 Print in PDF (10.09 KB, application/pdf)
2022-08-31 15:25 PDT, Ahmad Saleem 		no flags
Details
Chrome Canary 107 Print Output (12.84 KB, application/pdf)
2022-08-31 15:26 PDT, Ahmad Saleem 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Brad
Comment 1 2014-01-07 12:58:06 PST
Correction: 1VW should instead be 1/100 of the WIDTH of the print area of the page.
Benjamin Poulain
Comment 2 2014-07-06 21:10:44 PDT
Created attachment 234476 [details] Patch
Benjamin Poulain
Comment 3 2014-07-06 21:17:42 PDT
Dave, Antti, Dean, could you please have a look at this first patch? I need to add tests and fix the exports, but I would like some early feedback. Something I know nothing about is the other type of pagination. I have no idea how the layout works for epub or paginated UIWebView.
Frances de Waal
Comment 4 2015-08-07 05:09:16 PDT
Not sure if this is related, but if font-size is set with vw it will not be printed at all in a webkit browser.
Chris Rebert
Comment 5 2015-09-10 01:29:53 PDT
(In reply to comment #4) > Not sure if this is related, but if font-size is set with vw it will not be > printed at all in a webkit browser. That sounds like https://code.google.com/p/chromium/issues/detail?id=382313
Chris Rebert
Comment 6 2016-04-11 22:22:05 PDT
Still reproduces in recent Nightly.
Ahmad Saleem
Comment 7 2022-08-31 15:25:38 PDT
Created attachment 462057 [details] Safari Technology Preview 152 Print in PDF
Ahmad Saleem
Comment 8 2022-08-31 15:26:52 PDT
Created attachment 462058 [details] Chrome Canary 107 Print Output It is same for Firefox Nightly 106.
Ahmad Saleem
Comment 9 2022-08-31 15:27:15 PDT
I am able to reproduce this bug in STP 152 and please refer to attached PDF for reference. Thanks!
Radar WebKit Bug Importer
Comment 10 2022-08-31 16:06:25 PDT
<rdar://problem/99408675>
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