(Re-)Add Optional Splash Screens

[RobDolinMS]

This issue proposes resurrecting the splash_screens object that was removed with PR #440

While UAs can fall-back to using one of the smaller images and a background color, offering the optional splash screens object gives web app developers an option to have the UA display a larger, more detailed image while their app loads.

(Example from prior spec version)

  "splash_screens": [{
        "src": "splash/lowres",
        "sizes": "320x240"
      }, {
        "src": "splash/hd_small",
        "sizes": "1334x750"
      }, {
        "src": "splash/hd_hi",
        "sizes": "1920x1080",
        "density": 3
      }],

[RobDolinMS]

Discussing with @boyofgreen and may want to get this from icons object. Closing for now.

[benfredwells]

Interesting that this just came up. We (Chrome) have been discussing this. We currently get something from icons, but would like to do something better.

We are tossing up two options - having some way of specifying splash screen images like this proposal, or having a splash screen url declared. With the url method the site could generate a page and the browser would probably grab a snapshot of it.

Any comments on either approach?

[benfrancis]

Only that this has been discussed at great length before. See #9 and also #361, #372, #373 and #390.

I would personally recommend sticking with the icon and background colour.

[marcoscaceres]

If need be, please reopen #9 to discuss further.