In the code <p class="fancy plain">Hi</p>, what color font will be used?

In the provided HTML code snippet, the font color for the text inside the paragraph element is determined by the CSS styles associated with the classes "fancy" and "plain". If there are no specific styles defined for either of these classes in the associated CSS file or embedded styles, the text will utilize the browser's default styling for paragraph elements.

Typically, in modern web browsers, the default color for text is black, unless otherwise specified by CSS. Therefore, if neither "fancy" nor "plain" includes any styling that changes the font color, the text "Hi" will appear in black. Thus, the most accurate answer regarding the color of the font in this context is black, assuming no additional styles are applied that would alter it.