Thanks for the report.  Sending over to CSS team, is there intent?

Thank you for reporting this. Do you have a test case?

At a minimum, please squash the warning asap, similar to  Issue 569649  [1], since we are all stuck with this one now as well, thanks to the iPhone X.

Regarding a test case, example meta tag is: <meta name='viewport' content='initial-scale=1, viewport-fit=cover’>, Chrome complains about 'viewport-fit' as described by the original reporter.

Thanks,
- John

[1] https://bugs.chromium.org/p/chromium/issues/detail?id=569649

Reproduces in:
Google Chrome	62.0.3202.94 (Official Build) (64-bit)
Revision	4fd852a98d66564c88736c017b0a0b0478e885ad-refs/branch-heads/3202@{#789}
OS	Mac OS X
JavaScript	V8 6.2.414.42
User Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36

I've attached a file that has the meta tag mentioned above. If viewing the file on an iPhone X simulator, the page should not have in-sets. If "viewport-fit=cover" is removed, the iPhone X simulator will display the page with in-sets.

Deleted: viewport-fit.html 307 bytes

viewport-fit.html 307 bytes View Download

Deleted: with-viewport-fit.png 21.0 KB

	with-viewport-fit.png 21.0 KB View Download

Deleted: without-viewport-fit.png 20.9 KB

	without-viewport-fit.png 20.9 KB View Download

Thank you for providing more feedback. Adding requester "rjwright@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I want to second comment 4, please remove the console warning:

> The key "viewport-fit" is not recognized and ignored.

Change in review:
https://chromium-review.googlesource.com/#/c/chromium/src/+/781302

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/609e1af2dfff95caf54a6231e80dbb38a6fd5a6d

commit 609e1af2dfff95caf54a6231e80dbb38a6fd5a6d
Author: Victoria Su <victoriaytsu@google.com>
Date: Thu Nov 23 22:48:14 2017

DevTools: No warning for meta viewport viewport-fit

Suppressed warning "The key 'viewport-fit' is not recognized and ignored."

BUG=780904

Change-Id: Ieb4ea9d6ec88fcb56304625212032e0655e3829c
Reviewed-on: https://chromium-review.googlesource.com/781302
Reviewed-by: nainar <nainar@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Victoria Su <victoriaytsu@google.com>
Cr-Commit-Position: refs/heads/master@{#519024}
[modify] https://crrev.com/609e1af2dfff95caf54a6231e80dbb38a6fd5a6d/third_party/WebKit/Source/core/html/HTMLMetaElement.cpp
[modify] https://crrev.com/609e1af2dfff95caf54a6231e80dbb38a6fd5a6d/third_party/WebKit/Source/core/page/ViewportTest.cpp
[add] https://crrev.com/609e1af2dfff95caf54a6231e80dbb38a6fd5a6d/third_party/WebKit/Source/core/testing/data/viewport/viewport-warnings-8.html

This bug remains open as "viewport-fit=cover" is not currently supported by Blink.

We have simply suppressed the warning.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot