fix(html): print a text page with a page frame whole

CHANGELOG.md

@@ -34,6 +34,9 @@ The release run heads these entries with the version and opens a fresh
 - An ods formula with spaces between a function name and its parenthesis, as
   LibreOffice writes `ROUND (`, parses, computes and moves with structural
   edits.
+- A text page that holds a frame anchored to the page, such as a letter
+  template, prints whole on one sheet, so the frame stays where the page puts
+  it.
 
 ## v7.5.0 - 2026-10-06
 

src/odr/internal/html/document.cpp

@@ -157,9 +157,16 @@ viewport_mode_override(const Document &document, const HtmlConfig &config) {
 
 /// The sheet a page box prints on, sized by the first page. A text page puts
 /// its margins on the sheet instead, so text that runs past a sheet keeps them.
+/// A frame placed on the page stands off the page edge, not the margin, so a
+/// text page holding one prints whole like a slide.
 void write_print_page_style(HtmlWriter &out, const Document &document) {
   const Element root = document.root_element();
   const bool text = document.document_type() == DocumentType::text;
+  const bool fixed =
+      !text || std::ranges::any_of(root.children(), [](const Element &child) {
+        return child.type() == ElementType::frame &&
+               child.as_frame().anchor_type() == AnchorType::at_page;
+      });
 
   PageLayout page_layout;
   if (text) {
@@ -178,8 +185,11 @@ void write_print_page_style(HtmlWriter &out, const Document &document) {
     out.out() << "size:" << css_length(*page_layout.width) << " "
               << css_length(*page_layout.height) << ";";
   }
-  if (!text) {
+  if (fixed) {
     out.out() << "margin:0}";
+    if (text) {
+      out.out() << "@media print{.odr-page-outer{min-height:0!important}}";
+    }
     out.write_header_style_end();
     return;
   }

test/src/html_test.cpp

@@ -497,6 +497,42 @@ TEST(html, a_text_page_prints_with_its_margins_on_the_sheet) {
   EXPECT_EQ(render_odt(config).find("@page{"), std::string::npos);
 }
 
+TEST(html, a_text_page_with_a_frame_on_the_page_prints_whole) {
+  const auto render = [](const std::string &anchor) {
+    const std::string fodt =
+        R"(<?xml version="1.0" encoding="UTF-8"?>)"
+        R"(<office:document)"
+        R"( xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0")"
+        R"( xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0")"
+        R"( xmlns:draw="urn:oasis:names:tc:opendocument:xmlns:drawing:1.0")"
+        R"( xmlns:svg="urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0")"
+        R"( office:version="1.3")"
+        R"( office:mimetype="application/vnd.oasis.opendocument.text">)"
+        R"(<office:body><office:text><draw:frame text:anchor-type=")" +
+        anchor +
+        R"(" svg:x="1cm" svg:y="1cm" svg:width="2cm" svg:height="1cm">)"
+        R"(<draw:text-box><text:p>head</text:p></draw:text-box></draw:frame>)"
+        R"(<text:p>body</text:p></office:text></office:body></office:document>)";
+    HtmlConfig config;
+    config.text_document_margin = true;
+    std::ostringstream out;
+    html::translate(open(File::from_memory(fodt),
+                         DecodeOptions::as(FileType::opendocument_text)),
+                    config)
+        .list_views()
+        .at(0)
+        .write_html(out);
+    return std::move(out).str();
+  };
+
+  const std::string page = render("page");
+  EXPECT_NE(page.find("@page{margin:0}"), std::string::npos);
+  EXPECT_EQ(page.find(".odr-page-inner{margin:0!important}"),
+            std::string::npos);
+  EXPECT_NE(render("paragraph").find(".odr-page-inner{margin:0!important}"),
+            std::string::npos);
+}
+
 // A browser floors the page scale at 0.25, so a page more than four screens
 // wide cannot be zoomed out to. A wider page states a floor of its own.
 TEST(html, fitting_the_width_states_a_floor_a_wide_page_needs) {