User:Mxn/57826

CSS:

.error {
	color: red;
	text-decoration: blink;
}

Whitespace (doesn't run because of this bug – all Ts should be followed by blue tabs, not red spaces):

S S S T	S S T	S S S L
T	L
S S S S S T	T	S S T	S T	L
T	L
S S S S S T	T	S T	T	S S L
T	L
S S S S S T	T	S T	T	S S L
T	L
S S S S S T	T	S T	T	T	T	L
T	L
S S S S S T	S T	T	S S L
T	L
S S S S S T	S S S S S L
T	L
S S S S S T	T	T	S T	T	T	L
T	L
S S S S S T	T	S T	T	T	T	L
T	L
S S S S S T	T	T	S S T	S L
T	L
S S S S S T	T	S T	T	S S L
T	L
S S S S S T	T	S S T	S S L
T	L
S S S S S T	S S S S T	L
T	L
S S L
L
L