Set a hud element to transition in fontScale over time. Normally setting the fontScale of an element causes an immediate visual change. However, if the fontScale gets set within <time> after calling ChangeFontScaleOverTime, then the hud element will transition to the new fontScale over the remaining <time>.
Example:
level.introstring1 ChangeFontScaleOverTime( 1.2 ); level.introstring1.fontScale = 0.3; // This will transition the fontScale from whatever it was before to the new value of 0.3 over 1.2 seconds.