Combining two or more CSS selectors with a boolean condition

These should work:

&& = div.message.error {}
|| = div.message, div.error {}

Don't think you can do "not"

Edit: Just did a quick test to confirm:

<html>
    <head>
        <style type="text/css">
            div.error.message {
                background-color: red;
            }
            div.message, div.error {
                border: 1px solid green;
            }
        </style>
    </head>
    <body>
        <div>None</div>
        <div class="error">Error</div>
        <div class="message">Message</div>
        <div class="error message">Error Message</div>
    </body>
</html>

The "message", "error" and "error message" divs all have a green border and only the "error message" div has a red background.


Try div.message.error.

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Css

Css Selectors

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