Add a possibility to issue warnings to the user

[remys]

May it is useful to add the following styling rule to the framework:
p[warning] {
background-color:yellow;
margin:0;
padding:0;
}
p[warning]:before {
content:"⚠️";
}
This will apply a yellow background colour, and add the warning symbol in front of the paragraph.
Example

Your password is invalid!

[gaffling]

I implement it for me like this:

      message {
        border: 1px solid;
        border-radius:2px;
        margin: 10px 0px 20px;
        padding: 15px 10px 15px 20px;
        display: block;
      }
      message[error] {
        color: #d8000c;
        background: #ffbaba;
      }
      message[success] {
        color: #4f8a10;
        background: #dff2bf;
      }
      message[warning] {
        color: #9f6000;
        background: #feefb3;
      }
      message[info] {
        color: #00529b;
        background: #bde5f8;
      }

can be used like this:

      <message error tt="ERROR">
        Your password is invalid!
      </message>

and if you like add this:

      message[error]:before {
        content: '❌';
      }
      message[success]:before {
        content: '💚';
      }
      message[warning]:before {
        content: '⚠️';
      }
      message[info]:before {
        content: '📘';
      }

Please Comment what do you think about ;-)

[COil]

I have done this when using the default Symfony form theme:

        <style>
            label.required:after {
                content: " *";
            }
            form > div > div > ul > li {
                color: red;
            }
        </style>