An update to version 17 of the Mongolian character picker is now available.
When you hover over or select a character in the selection area, the box to the left of that area displays the alternate glyph forms that are appropriate for that character. By default, this only happens when you click on a character, but you can make it happen on hover by clicking on the V in the gray selection bar to the right.
The list includes the default positional forms as well as the forms produced by following the character with a Free Variation Selector (FVS). The latter forms have been updated, based on work which has been taking place in 2015 to standardise the forms produced by using FVS. At the moment, not all fonts will produce the expected shapes for all possible combinations. (For more information, see Notes on Mongolian variant forms.)
An additional new feature is that when the variant list is displayed, you can add an appropriate FVS character to the output area by simply clicking in the list on the shape that you want to see in the output.
This provides an easy way to check what shapes should be produced and what shapes are produced by a given font. (You can specify which font the app should use for display of the output.)
Some small improvements were also made to the user interface. The picker works best in Firefox and Edge desktop browsers, since they now have pretty good support for vertical text. It works least well in Safari (which includes the iPad browsers).
For more information about the picker, see the notes at the bottom of the picker page.
About pickers: Pickers allow you to quickly create phrases in a script by clicking on Unicode characters arranged in a way that aids their identification. Pickers are likely to be most useful if you don’t know a script well enough to use the native keyboard. The arrangement of characters also makes it much more usable than a regular character map utility. See the list of available pickers.