This PR was merged into the 5.4 branch.Discussion----------[Validator] Added `CssColor` constraint| Q             | A| ------------- | ---| Branch?       | 5.4| Bug fix?      | no| New feature?  | yes| Deprecations? | no| Tickets       || License       | MIT| Doc PR        |symfony/symfony-docs#14965This PR introduces a new `CssColor` constraint. It comes with 3 validation modes:- Long, which allows all hexadecimal representation of a color, or 9 (#EEEEEEFF) characters- Short, which only allows hexadecimal colors on 4 (#EEE), 5 (#FFF00) characters- Named colors, which matches [the official list of named colors](https://www.w3.org/TR/css-color-4/#named-color)- HTML5, which allows hexadecimal colors on 7 (#EEEEEE) characters as well as the HTML5 input type colorI know that such a color validation already exists in Symfony (in the `ColorType` class), but it's hardcoded in the FormType, and not usable as an assert Annotation. We could decide to remove this hardcoded validation in favor of the new added `CssColor` constraint. Let me know, if yes, I will make the change.Commits-------b36371c Added new CssColor constraint

This PR was merged into the 5.4 branch.Discussion----------[Validator] Added `CssColor` constraint| Q             | A| ------------- | ---| Branch?       | 5.4| Bug fix?      | no| New feature?  | yes| Deprecations? | no| Tickets       || License       | MIT| Doc PR        |symfony/symfony-docs#14965This PR introduces a new `CssColor` constraint. It comes with 3 validation modes:- Long, which allows all hexadecimal representation of a color, or 9 (#EEEEEEFF) characters- Short, which only allows hexadecimal colors on 4 (#EEE), 5 (#FFF00) characters- Named colors, which matches [the official list of named colors](https://www.w3.org/TR/css-color-4/#named-color)- HTML5, which allows hexadecimal colors on 7 (#EEEEEE) characters as well as the HTML5 input type colorI know that such a color validation already exists in Symfony (in the `ColorType` class), but it's hardcoded in the FormType, and not usable as an assert Annotation. We could decide to remove this hardcoded validation in favor of the new added `CssColor` constraint. Let me know, if yes, I will make the change.Commits-------b36371c06e Added new CssColor constraint

…aviereguiluz)This PR was merged into the 5.4 branch.Discussion----------[Validator] Some tweaks to CssColor constraintThis tweaks the great work made by `@welcoMattic` insymfony#14965.It's mostly minor tweaks ... but I also expanded the "basic usage" example to show the case of not adding any parameters to the constraint, which is a common case when you just want to allow any of the valid CSS color formats.Commits-------07e38b7 [Validator] Some tweaks to CssColor constraint