Error in dashicons page

[tazotodua]

When I click to get the code, it shows empty field:

​https://i.imgur.com/EpCJskZ.png

[Ipstenu]

What browser OS are you on? This works for me on Chrome/MacOS X High Sierra.

[Otto42]

I can reproduce this. Only seems to happen with the Twitter one. Chrome, Windows 10.

[Otto42]

Seems to be specific to the use of the "f301" glyph. If I change the number in the alt to anything else like f300 or f302, then I get a glyph. The wrong one, of course, but a copyable character nevertheless.

Anybody know what the f301 code point is possibly used for, other than what the dashicons font is using it for?

[Otto42]

Mentioned on the github, in case somebody there might have some insight:
​https://github.com/WordPress/dashicons/issues/254

[tazotodua]

everything seems coded correctly:

but problem happens, maybe problem is on javascript side?

[obenland]

This seems to work for me now. Is anyone able to reproduce that still?

[SergeyBiryukov]

Replying to obenland:

This seems to work for me now. Is anyone able to reproduce that still?

Yep, reproduced with Opera 53 on Windows.

[Otto42]

Still happens for me too. Chrome Version 69.0.3452.0 (Official Build) dev (64-bit), Windows 10.

[dd32]

Just noting that this is probably a Windows-only issue, as I'm not seeing it on Mac (It's just a [?] icon).

[roytanck]

Chrome 81 on Windows 8.1 (don't ask) -> I'm getting a copyable character in the popup for the Twitter icon. So maybe it's Windows 10 specifically?

[zodiac1978]

Thanks to some testing from @florianbrinkmann I have some more info to share:

Digging a little deeper, I found out the following: A long time ago, SIL had the character »HEBREW MARK LOWER DOT« (sounds like the thing I see in Firefox) in its SIL Corporate PUA (Private Use Area) at the code U+F301. It changed to U+05C5 in Unicode 4.1
​https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=PUA_Deprecated

So I guess, Windows has fonts that still support that character on that 301 position, and at least in Firefox and Chrome, one of that fonts is used. Times New Roman, for example, seems to have the dot in that place:
​https://www.fileformat.info/info/unicode/char/f301/fontsupport.htm

[zodiac1978]

When I click to get the code, it shows empty field:

I think it is not empty, but not showing correctly. Again @florianbrinkmann helped me to understand:

Just re-checked, no something is in there. It is only visible when the field content is not selected. It looks like a dot in the field, after copying it to the default Windows editor it becomes the unkown-character-sign (question mark with border). That is the character: 

I've checked the character with Apfelstrudel (​https://eclecticlight.co/text-utilities-nalaprop-dystextia-and-others/) and it shows as "ef 8c 81" which is the UTF-8 hex value for F301:
​https://www.fileformat.info/info/unicode/char/f301/index.htm

So it is not empty. It "just" seems to be a font problem showing a small/invisible character there.