(doc) Change search placeholder text.

[zzmp]

Update placeholder text to make keyboard shortcuts more apparent. As discussed in #15010.

[zzmp]

@kballard, as a separate issue, ? does not work for me in Chrome or Firefox, although it is documented in the raw html.

I'm not sure if I should be rebasing to take that out of the placeholder, or I should be opening a separate issue to fix whatever javascript should be capturing that keystroke (or both).

[lilyball]

@zzmp I think you should just open a separate PR to fix it.

FWIW, I just looked a bit, and the current code is relying on the keyCode property of the event. As far as I'm aware, this is a platform- and implementation-dependent value. For example, in Safari on my computer, both slash (/) and question mark (?) have the keyCode of 191 (with the shiftKey to distinguish them). The code right now is looking for 188.

It seems that on IE and Firefox, the proper solution is to use the key property, and on Safari and Chrome, the proper solution is to use the keyIdentifier property (of the originalEvent; apparently JQuery doesn't bother surfacing that up onto its wrapper object). For the latter, the expected value for ? is U+003F. For the former, I'm not sure, you can test on Firefox to find out.

I'm actually vaguely surprised that s works in Safari.

I'm also surprised JQuery doesn't apparently abstract this away for you.

[zzmp]

@kballard There's a nifty mousetrap library for JavaScript that abstracts all this for you. If you look at the W3 specs, a lot of the keyCode like properties are either deprecated or up in the air.

I'll get to the PR by EOD if noone beats me to it. Thanks for the tips.