Loss of error border for numeric input out of range

[Will Gray]

I just upgraded from 0.10.x to 0.12.2 and noticed that a feature has disappeared (or changed enough that I no longer see it).  When entering a value into a numericInput, if the value was out of range, a red border was added to the input.  But it no longer works.  Do I need to do something else to activate that?

[Yihui Xie]

I believe this behavior is defined by the web browser instead of shiny
(I could be wrong). That said, I can reproduce this issue and I do
remember previously there was a red border. Perhaps it was because we
changed something in shiny (I don't know) or web browsers no longer
show the red border.

Regards,
Yihui

[Winston Chang]

It looks like this behavior was removed in Bootstrap 3, which Shiny switched to in version 0.11.

The reasoning behind the change is discussed here:

  https://github.com/twbs/bootstrap/issues/8093

There's an open issue in Shiny for this (and another closely-related change):

  https://github.com/rstudio/shiny/issues/927

-Winston

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