katom types from ref/ in groups, @table :leading in lines of text and :rulesep, @code under txt, one table style attribute, literal-klammer options (from dev 2e453744f5e9)

kdesc --katoms is Klammertext rendered from ref/, the types in titled groups,
with --katoms full for the regex column.  @table :leading L is L lines of the
surrounding text in html as in pdf (default 1), and :rulesep spaces the
horizontal rules.  The html table has one style attribute, so :column_width
fractions take effect again.  @code and @source_listing render in plain
text; captions are numbered per kind there, and a table needs no blank line
around it.  @c takes :nd, and an option-shaped word before a bar inside
literal code is code.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

sks/target/html_util.py

@@ -238,7 +238,12 @@ def hpos_container(element, hpos, offset=None):
 
 def add_caption(element, caption_label, number, caption_text,
                 font_symbol="i", hpos="center", side="bottom", as_string=True,
-                font_size=.9, width=None, max_width=None, offset=None):
+                font_size=.9, width=None, max_width=None, offset=None,
+                caption_align=None):
+    # caption_align "left" sets the caption flush with the element's left
+    # edge, where the default centres it over the element: a caption above
+    # a left-placed listing, which the tex target sets as a paragraph on the
+    # listing's own indent.
     tag = element_tag(element)
     # Caption
     caption = ""
@@ -276,6 +281,8 @@ def add_caption(element, caption_label, number, caption_text,
         #print("-"*80)
 
         element = E("div").cls("caption_" + side).attr("data-label", caption_label).body(element)
+        if caption_align == "left" and side in {"top", "bottom"}:
+            element.cls("caption_flush_left")
         if width:
             # The element's width (e.g. a table's :column_width total) lives
             # on this wrapper: the element fills it, and the caption tracks