Twenty Nineteen: Can't use hex colors in color picker/customiser

[eranthomson]

Colour picker only has a slider so we can't set specific values.
Def need to be able to do this

[kjellr]

Hi, @eranthomson, thanks for the report. The omission of a hex color picker in Twenty Nineteen was an intentional design decision.

During development, Twenty Nineteen's original custom color implementation allowed for users to enter a Hex value. This was problematic in that it opened the door to very inaccessible color combinations throughout users sites. We looked into the addition of a color contrast checker to warn users about that, but ultimately abandoned that idea after considering the bulk and complexity it'd add to the theme.

In the end, we borrowed a solution from Twenty Seventeen, and implemented a color hue picker instead. The hue picker allows people to customize the color while also guiding them towards a more accessible palette in general.

You can read more background on this decision in the following threads:

• ​https://github.com/WordPress/twentynineteen/issues/191
• ​https://github.com/WordPress/twentynineteen/pull/113