newlines
<link rel="help" href="https://w3c.github.io/webvtt/#webvtt-parser-algorithm">

assert_equals(cues.length, 4);

assert_equals(cues[0].id, "cr");
assert_equals(cues[0].text, "text0");

assert_equals(cues[1].id, "lf");
assert_equals(cues[1].text, "text1");

assert_equals(cues[2].id, "crlf");
assert_equals(cues[2].text, "text2");

assert_equals(cues[3].id, "lfcr");
assert_equals(cues[3].text, "text3");

===
WEBVTT\r\
\r\
cr\r\
00:00:00.000 --> 00:00:01.000\r\
text0\n\
\n\
lf\n\
00:00:00.000 --> 00:00:01.000\n\
text1\r\n\
\r\n\
crlf\r\n\
00:00:00.000 --> 00:00:01.000\r\n\
text2\n\
\r\
lfcr\r\
00:00:00.000 --> 00:00:01.000\n\
text3\n\
\r