+ return $rank;
+ }
+
+ while (my ($browser, $vercols) = each %versions) {
+ my $div = 0; # multiplier exponent (decreased to lower value)
+ my @vers = map { $row->{$browser}->{$_} } @$vercols;
+ if (my $current = $caniuse->{agents}->{$browser}->{versions}->[-3]) {
+ my @future; # find upcoming releases (after current)
+ for (reverse @$vercols) {
+ last if $_ eq $current;
+ push @future, pop @vers;
+ $_ eq 'u' and $_ = $vers[-1] for $future[-1]; # inherit latest value if unknown
+ }
+ splice @vers, -1, 0, @future; # move ahead to decrease precedence
+ }
+ $rank += $statspts->{$_} * 2**($div--) for reverse @vers;
+ }
+ }
+ return $rank;
+}
+
+sub saytitlecol {
+ my ($id) = @_;
+ my $row = $caniuse->{data}->{$id};
+
+ for ($row->{categories}) {
+ my $cell = $_ ? lc $_->[0] : '-';
+ $cell =~ s/ api$//; # trim unessential fluff in 'js api'
+ printf '<th title="%s">%s', join(' + ', @$_), $cell;
+ }
+
+ print '<td>', map {
+ sprintf('<a href="%s" onclick="%s">%s</a>',
+ "#$id",
+ sprintf("try { %s; return false } catch(err) { return true }",
+ "document.getElementById('$id').classList.toggle('target')",
+ ),
+ Entity($_),
+ );
+ } $row->{title};
+ print '<div class=aside>';
+ s/\.?$/./, print "<p>$_</p>" for map { ref $_ ? @$_ : $_ || () }
+ Entity($row->{description}),
+ map { s/\s*\n/\n<br>/g; $_ } $row->{notes};
+ printf 'Resources: %s.', join(', ', map {
+ sprintf '<a href="%s">%s</a>', EscapeHTML($_->{url}), $_->{title}
+ } @$_) for grep { @$_ } $row->{links} // ();
+ printf '<br>Parent feature: %s.', join(', ', map {
+ sprintf '<a href="%s">%s</a>', EscapeHTML("#$_"), $caniuse->{data}->{$_}->{title}
+ } $_) for $row->{parent} || ();
+ print '</div>';
+}
+
+sub saystatuscol {
+ my ($id) = @_;
+ my $row = $caniuse->{data}->{$id};
+
+ for ($row->{status}) {
+ my $cell = $_ // '-';
+ $cell = sprintf '<a href="%s">%s</a>', $_, $cell for $row->{spec} // ();
+ printf '<td title="%s" class="l %s">%s',
+ $caniuse->{statuses}->{$_}, $CSTATUS{$_} // '', $cell;
+ }
+}
+
+sub saybrowsercols {
+ my ($id, $browser) = @_;
+ my $feature = $caniuse->{data}->{$id};
+ my $data = $feature->{stats}->{$browser};
+ if (ref $data eq 'ARRAY') {
+ # special case for unsupported
+ my $release = $caniuse->{agents}->{$browser}->{verrelease};
+ $data = {
+ map { $_ => defined $release->{$_} ? 'u' : 'n' } keys %$release
+ };
+ }
+
+ my ($prev, @span);
+ for my $ver (@{ $versions{$browser} }, undef) {
+ my $compare = (
+ !defined $ver ? undef : # last column if nameless
+ ref $data ne 'HASH' ? '' : # unclassified if no support hash
+ $data->{ $ver->[-1] } // $prev # known or inherit from predecessor
+ // (grep { defined } @{$data}{ map { $_->[0] } @{ $versions{$browser} } })[0]
+ ~~ 'n' && 'n' # first known version is unsupported
+ || 'u' # unsure
+ );
+ unless (!defined $prev or $prev ~~ $compare) {
+ my $usage = sum(@{ $canihas->{$browser} }{ map { @{$_} } @span });
+
+ # strip #\d note references from support class
+ my @notes;
+ push @notes, $feature->{notes_by_num}->{$1}
+ while $prev =~ s/\h \# (\d+) \b//x;
+
+ # prepare version hover details
+ my $title = sprintf('%.1f%% %s', $usage * $usagepct, join(', ',
+ map { ref $_ eq 'CODE' ? $_->($browser) : $_ }
+ map { $DSTATS{$_} // () }
+ map { split / /, $_ }
+ $prev
+ ));
+ $title .= "\n".EscapeHTML($_) for @notes;
+
+ printf('<td class="%s" colspan="%d" title="%s">%s',
+ join(' ',
+ X => $CSTATS{$prev},
+ !$usage ? ('p0') : ('p',
+ sprintf('p%01d', $usage * ($usagepct - .0001) / 10),
+ sprintf('p%02d', $usage * ($usagepct - .0001)),
+ ),
+ sprintf('pp%02d', $usage / $usagemax),
+ ),
+ scalar @span,
+ $title,
+ showversions($span[0]->[0], @span > 1 ? ($span[-1]->[-1]) : ()),
+ );
+ undef $prev;
+ @span = ();