As of my knowledge cutoff date in September 2021, there is no direct CSS property called accent-color opposite. The accent-color property is used to define a color that represents an accent, and its behavior depends on the user agent's default styles. The accent-color property allows browsers and user agents to automatically apply an appropriate color based on the system's theme, user preferences, or accessibility settings.

However, if you want to achieve an "opposite" effect for the accent-color, you can consider using CSS variables (custom properties) and some additional CSS logic.

Here's an example of how you can create an "opposite" color effect using CSS variables:

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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Opposite Accent Color Example</title> <style> :root { --accent-color: #ff0000; /* Define your primary accent color here */ --opposite-accent-color: #00ff00; /* Define the opposite color here */ } /* Use the accent-color for the element */ .accent-element { background-color: var(--accent-color); color: white; padding: 1rem; } /* Use the opposite-accent-color for the element when a specific class is present */ .opposite-accent-element { background-color: var(--opposite-accent-color); color: white; padding: 1rem; } </style> </head> <body> <div class="accent-element">This is an element with the accent color.</div> <div class="opposite-accent-element">This is an element with the opposite accent color.</div> </body> </html>

In this example, we define two CSS variables (--accent-color and --opposite-accent-color) at the :root level. Then, we use these variables to style elements with the accent-element and opposite-accent-element classes. When the opposite-accent-element class is applied to an element, it uses the --opposite-accent-color variable for its background, creating an "opposite" effect to the primary accent color specified by --accent-color.

Please note that this approach relies on explicitly defining the "opposite" color through a CSS variable. The actual opposite color may vary depending on your specific use case and color palette. If you need dynamic color manipulation, you might need to use JavaScript to calculate the opposite color based on the primary accent color dynamically.

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