commit 1f370a33536008c80c8e363a8097a9daef772c65
Author: Thibaut Cuvelier <[email protected]>
Date:   Mon Jan 9 01:50:05 2023 +0100

    LyXHTML: avoid using v/align HTML attributes in tables, they are deprecated 
(like most attributes for td).
    
    Also implement alignment at character in CSS.
---
 src/insets/InsetTabular.cpp |  103 +++++++++++++++++++++++++++++++------------
 src/insets/InsetTabular.h   |   10 +++-
 2 files changed, 82 insertions(+), 31 deletions(-)

diff --git a/src/insets/InsetTabular.cpp b/src/insets/InsetTabular.cpp
index 18481a5..265a016 100644
--- a/src/insets/InsetTabular.cpp
+++ b/src/insets/InsetTabular.cpp
@@ -3628,31 +3628,63 @@ std::string Tabular::getVAlignAsXmlAttribute(idx_type 
cell) const
 }
 
 
-std::string Tabular::getHAlignAsXmlAttribute(idx_type cell, const 
XmlOutputFormat output_format) const
+std::string Tabular::getVAlignAsCssAttribute(idx_type cell) const
+{
+       switch (getVAlignment(cell)) {
+       case LYX_VALIGN_TOP:
+               return "vertical-align: top";
+       case LYX_VALIGN_BOTTOM:
+               return "vertical-align: bottom";
+       case LYX_VALIGN_MIDDLE:
+               return "vertical-align: middle";
+       default:
+               // This case only silences a compiler warning, as all the cases 
are covered above.
+               return "";
+       }
+}
+
+
+std::string Tabular::getHAlignAsXmlAttribute(idx_type cell) const
 {
        switch (getAlignment(cell)) {
        case LYX_ALIGN_LEFT:
                return "align='left'";
        case LYX_ALIGN_RIGHT:
                return "align='right'";
+       case LYX_ALIGN_BLOCK:
+               return "align='justify'";
+       case LYX_ALIGN_DECIMAL: {
+               Language const *lang = 
buffer().paragraphs().front().getParLanguage(buffer().params());
+               return "align='char' char='" + 
to_utf8(lang->decimalSeparator()) + "'";
+       }
+       default:
+               return "align='center'";
+       }
+}
 
+
+std::string Tabular::getHAlignAsCssAttribute(idx_type cell) const
+{
+       switch (getAlignment(cell)) {
+       case LYX_ALIGN_LEFT:
+               return "text-align: left";
+       case LYX_ALIGN_RIGHT:
+               return "text-align: right";
+       case LYX_ALIGN_BLOCK:
+               return "text-align: justify";
+       case LYX_ALIGN_DECIMAL: {
+               // In theory, character-level alignment is supported for CSS4, 
but it's
+               // experimental.
+               // https://www.w3.org/TR/css-text-4/#character-alignment
+               Language const *lang = 
buffer().paragraphs().front().getParLanguage(buffer().params());
+               return "text-align: '" + to_utf8(lang->decimalSeparator()) + 
"'";
+       }
        default:
-               // HTML only supports left, right, and center.
-               if (output_format == XmlOutputFormat::XHTML)
-                       return "align='center'";
-
-               // DocBook also has justify and decimal.
-               if (getAlignment(cell) == LYX_ALIGN_BLOCK) {
-                       return "align='justify'";
-               } else if (getAlignment(cell) == LYX_ALIGN_DECIMAL) {
-                       Language const *tlang = 
buffer().paragraphs().front().getParLanguage(buffer().params());
-                       return "align='char' char='" + 
to_utf8(tlang->decimalSeparator()) + "'";
-               } else {
-                       return "align='center'";
-               }
+               return "text-align: center";
        }
 }
 
+
 Tabular::XmlRowWiseBorders Tabular::computeXmlBorders(row_type row) const
 {
        Tabular::XmlRowWiseBorders borders;
@@ -3755,25 +3787,24 @@ docstring Tabular::xmlRow(XMLStream & xs, const 
row_type row, OutputParams const
                if (isPartOfMultiColumn(row, c) || isPartOfMultiRow(row, c))
                        continue;
 
-               stringstream attr;
-
-               if (is_xhtml_table) {
-                       const std::vector<std::string> styles = 
computeCssStylePerCell(row, c, cell);
-                       attr << "style='" ;
-               for (auto it = styles.begin(); it != styles.end(); ++it) {
-                               attr << *it;
-                               if (it != styles.end() - 1)
-                                       attr << "; ";
-               }
-                       attr << "' ";
-               }
+               stringstream attr; // Tag-level attributes, both for HTML and 
CALS.
+               stringstream style; // Tag-level CSS, only for HTML tables 
output in HTML.
 
                if (is_cals_table) {
                        if (!cals_row_has_rowsep && bottomLine(cell))
                                attr << "rowsep='1' ";
                }
 
-               attr << getHAlignAsXmlAttribute(cell, output_format) << " " << 
getVAlignAsXmlAttribute(cell);
+               if (output_format == XmlOutputFormat::XHTML) {
+                       // In HTML5, prefer to use CSS instead of attributes 
for alignment
+                       // (align and valign).
+                       style << getHAlignAsCssAttribute(cell) << " "
+                             << getVAlignAsCssAttribute(cell);
+               } else {
+                       // In DocBook, both for HTML and CALS tables, stick to 
attributes.
+                       attr << getHAlignAsXmlAttribute(cell) << " "
+                            << getVAlignAsXmlAttribute(cell);
+               }
 
                if (is_xhtml_table) {
                        if (isMultiColumn(cell))
@@ -3789,8 +3820,24 @@ docstring Tabular::xmlRow(XMLStream & xs, const row_type 
row, OutputParams const
                                attr << " colname='c" << (c + 1) << "'"; // 
CALS column numbering starts at 1.
                }
 
+               // Final step: prepend the CSS style.
+               std::string attr_str = attr.str();
+               if (is_xhtml_table) {
+                       const std::vector<std::string> styles = 
computeCssStylePerCell(row, c, cell);
+
+                       std::string attr_str_prefix = "style='" ;
+                       for (auto it = styles.begin(); it != styles.end(); 
++it) {
+                               attr << *it;
+                               if (it != styles.end() - 1)
+                                       attr_str_prefix += "; ";
+                       }
+                       attr_str_prefix += "' ";
+
+                       attr_str.insert(0, attr_str_prefix);
+               }
+
                // Render the cell as either XHTML or DocBook.
-               xs << xml::StartTag(cell_tag, attr.str(), true);
+               xs << xml::StartTag(cell_tag, attr_str, true);
                if (output_format == XmlOutputFormat::XHTML) {
                        ret += cellInset(cell)->xhtml(xs, runparams);
                } else if (output_format == XmlOutputFormat::DOCBOOK) {
diff --git a/src/insets/InsetTabular.h b/src/insets/InsetTabular.h
index 6c63cbc..f189714 100644
--- a/src/insets/InsetTabular.h
+++ b/src/insets/InsetTabular.h
@@ -945,9 +945,13 @@ private:
                DOCBOOK = false
        };
 
-       /// Transforms the vertical alignment of the given cell as a prebaked 
XML attribute (for HTML and CALS).
-       std::string getHAlignAsXmlAttribute(idx_type cell, XmlOutputFormat 
output_format) const;
-       /// Transforms the vertical alignment of the given cell as a prebaked 
XML attribute (for HTML and CALS).
+       /// Transforms the vertical alignment of the given cell as prebaked CSS 
(for HTML tables in HTML output).
+       std::string getHAlignAsXmlAttribute(idx_type cell) const;
+       /// Transforms the vertical alignment of the given cell as a prebaked 
XML attribute (for CALS or HTML tables in DocBook).
+       std::string getHAlignAsCssAttribute(idx_type cell) const;
+       /// Transforms the vertical alignment of the given cell as prebaked CSS 
(for HTML tables in HTML output).
+       std::string getVAlignAsCssAttribute(idx_type cell) const;
+       /// Transforms the vertical alignment of the given cell as a prebaked 
XML attribute (for CALS or HTML tables in DocBook).
        std::string getVAlignAsXmlAttribute(idx_type cell) const;
 
        /// Helpers for XML tables (XHTML or DocBook).
-- 
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