static S html_addTargetBlank(S html) {
L tok = htmlTok(html);
for (int i = 1; i < l(tok); i += 2) {
S t = tok.get(i);
if (isTag(t, "a")) {
SS map = htmlParams(t);
if (map.containsKey("href")) {
map.put("target", "_blank");
tok.set(i, hopeningtag("a", map));
}
}
}
ret join(tok);
}