1498860 - Consider implementing window.screenLeft and window.screenTop

Status: RESOLVED FIXED

(Core :: DOM: CSS Object Model, enhancement, P3)

Description

[Emilio Cobos Álvarez (:emilio)]

Looks like other browsers support it as basically aliases of screenX / screenY, and that they're not willing to remove them, see:

  * https://github.com/w3c/csswg-drafts/issues/1091
  * https://bugs.chromium.org/p/chromium/issues/detail?id=695572

Comment 1

[Emilio Cobos Álvarez (:emilio)]

Boris, would you have anything against doing this, provided relevant spec changes are made?

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

given that there are also other weird aliases for other coordinates, it is somewhat hard to argue why not do this.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

Alright, I can implement this once the tests and the spec are sorted out.

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I'd also argue that screenLeft and screenTop are *better* names than screenX and screenY since they make the coordinate system clearer.  (For RTL use cases you might even want screenRight...)

Comment 5

[Boris Zbarsky [:bzbarsky]]

No objections to doing this.

Comment 6

[Emilio Cobos Álvarez (:emilio)]

Attachment: Add window.screenLeft / window.screenTop as aliases of screenX / screenY.

Tests are at https://github.com/web-platform-tests/wpt/pull/13543.

Spec is waiting on those, but this matches all other browsers.

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7b427b166742
Add window.screenLeft / window.screenTop as aliases of screenX / screenY. r=smaug

Comment 8

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/7b427b166742

Comment 9

[Chris Mills [:cmills]]

Note to docs team:

I have added a note to the Fx 64 rel notes to cover this:
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/64#APIs

The ref pages will both need writing, and compat data updating, when this is documented.

Comment 10

[Chris Mills [:cmills]]

Documented:

I added new pages for the new properties, and also improved the pages for screenX/screenY:
https://developer.mozilla.org/en-US/docs/Web/API/Window/screenLeft
https://developer.mozilla.org/en-US/docs/Web/API/Window/screenTop
https://developer.mozilla.org/en-US/docs/Web/API/Window/screenX
https://developer.mozilla.org/en-US/docs/Web/API/Window/screenY

The pages link to a fun little demo I wrote to demonstrate how the properties work:
https://mdn.github.io/dom-examples/screenleft-screentop/

I also added the relevant compat data:
https://github.com/mdn/browser-compat-data/pull/3106

Let me know if this looks OK. Thanks!