.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;} .cm-trailingspace { background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAACCAYAAAB/qH1jAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3QUXCToH00Y1UgAAACFJREFUCNdjPMDBUc/AwNDAAAFMTAwMDA0OP34wQgX/AQBYgwYEx4f9lQAAAABJRU5ErkJggg==); background-position: bottom left; background-repeat: repeat-x; }
CodeMirror
Home Manual Code
Trailing Whitespace
Trailing Whitespace Demo
This text has some trailing whitespace!
var editor = CodeMirror.fromTextArea(document.getElementById("code"), { lineNumbers: true, showTrailingSpace: true });
Uses the trailingspace addon to highlight trailing whitespace.