Explain the purpose and usage of the 'currentColor' value in CSS.
Instruction: Describe how 'currentColor' works and provide examples of its practical applications.
Context: This question probes the candidate's understanding of the 'currentColor' keyword, a versatile tool in CSS for styling elements based on the current color context.
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For example, let's consider a scenario where we have a button with a dynamic foreground color, which depends on the theme of the...