We just added some new sinks to expressions. Give 'em a whirl.
errorMessage: shows an error icon with a tooltip. Recommended anytime that you can’t correctly parse / interpret the student’s input. Note: this is different from “warning”. Warning shows up for teachers in the Summary tab, “errorMessage” shows up just to the student. You may want to use both for syntax errors, but prioritize errorMessage, to give the most actionable feedback to students.
suffix: adds a string to the end of an expression input that shows up when the input is focused and when the input has content. Recommended for units (e.g. “ft”) or for percents ("%").
submitLabel: override “Submit to teacher” and “Submit to class” with custom button text (e.g. “Try it!”)
resetLabel: override the default reset text (e.g. to “Try again”)