txt section numbering, @typeface :middle/:lift and html scale, NewGardinerOmni, html :leading (from dev 9fa469dd74ed)

Section headings under txt are numbered inside a @document only; @typeface
gains :middle and :lift and its :scale now means the same in html and
pdf; NewGardinerOmni ships (OFL 1.1, Mark-Jan Nederhof) and @egyptian /
@chinese replace @cjk; @table :leading and :colsep reach html; kdesc
--typeface help names the flag; @document.txt is a Python class.

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

sks/font/font.py

@@ -60,9 +60,38 @@ class Typeface(klammer_base.Klammer_base):
         # this sits inside a double-quoted html attribute.  What is quoted
         # here is the MARKER: @document replaces it with the resolved
         # family name (see the marker note above).
+        # The size is the scale times the body's own enlargement: the body
+        # is rendered at "font-size-adjust: ex-height 0.5" (font.css), so
+        # the visible text is larger than its nominal size, and a span
+        # with the adjust off at a plain "Nem" sat about a fifth smaller
+        # against it than the same :scale in pdf.  @document emits the
+        # factor as --typeface_scale (document_html.cpp, font_definitions);
+        # the fallback 1 is for a fragment rendered without @document.
+        # The "*" of calc() survives the @eval re-read (tested 2026-09-18);
+        # the "--" of the property name is hidden below with the rest.
         style = "', serif; font-size-adjust: none"
-        if float(self.scale) != 1.0:
-            style += f"; font-size: {float(self.scale)}em"
+        style += f"; font-size: calc({float(self.scale)}em * var(--typeface_scale, 1))"
+        # :middle -- for a script with no baseline relationship to the
+        # text.  A browser sizes the span's inline box from the FONT's
+        # ascender and descender, not the glyph's ink, and centres it on
+        # the content area's midpoint; a hieroglyph font declares an
+        # ascender of 1.0 em and no descender (NewGardinerOmni; Noto:
+        # 1.324/-0.326), so at :scale 1.75 the box sat half an em too
+        # high and every table row grew from 31 to 47 px (Noto: 62).
+        # line-height 1 drops the body's leading from the enlarged box and
+        # vertical-align middle centres it on the PARENT's x-height, which
+        # is why this uses the text's metrics, not the script font's zeros.
+        # Measured 2026-09-18: 40 px, the floor the ink allows; line-height
+        # 0 alone gave 31 px with the glyphs overlapping the rows above.
+        # Off by default: a Latin typeface must keep the shared baseline.
+        if self.middle:
+            style += "; line-height: 1; vertical-align: middle"
+        if self.lift_length():
+            # Relative positioning moves the ink and nothing else: the
+            # line box is laid out as if the span had not moved, which is
+            # what a baseline correction wants (vertical-align would
+            # re-lay the line).  Negative top = up, as \raisebox in tex.
+            style += f"; position: relative; top: -{self.lift_length()}"
         # The STYLE is markup, so its typographically active characters are
         # hidden: the html target's transforms turn a single quote into a
         # curly one, which broke the css font-family value.  The MARKER is
@@ -81,7 +110,27 @@ class Typeface(klammer_base.Klammer_base):
         # makes the change temporary (the retired @font emitted a bare
         # \setmainfont, which changed the font for the rest of the
         # document).
-        return "{" + typeface_marker(self.name, self.scale) + " " + self.text + "}"
+        group = "{" + typeface_marker(self.name, self.scale) + " " + self.text + "}"
+        if self.lift_length():
+            # A \raisebox produced HERE is safe from the generator escaping
+            # pass: this klammer is applied after a generator's result has
+            # been escaped, so its backslash is never swept -- the trap
+            # @nl.tex fell into (2026-09-07) is a klammer applied inside a
+            # generator's ARGUMENT, which @typeface shares with @b and @i.
+            return "\\raisebox{" + self.lift_length() + "}" + group
+        return group
+
+    def lift_length(self):
+        # :lift, validated to the units both targets can move by.  The
+        # length argtype admits w/h fractions and a quoted string, which
+        # mean nothing as a vertical shift; a bare number would be columns
+        # or lines and is refused for the same reason.
+        lift = self.lift
+        if not lift:
+            return ""
+        if not re.fullmatch(r"-?(\d+\.?\d*|\.\d+)(em|pt|px)", lift):
+            raise Exception(f"@typeface :lift takes a length in em, pt or px, not '{lift}'")
+        return lift
 
     def txt(self):
         # A typeface cannot be expressed in plain text.  Declared in the