fix(html): put a page-anchored frame on the page, not in the text

A frame took its placement from its wrap alone, so one anchored to the
page floated into the running text: a letter's address, date and footer
boxes landed between the paragraphs instead of in their fields. Only a
frame anchored in the text reads the wrap now; one anchored to the page
sits at its own coordinates on it.

The reference output also picks up the shipped css and js, which had
drifted from what the engine emits since #679, #682, #683 and #685 - the
same html rendered differently there than freshly generated.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J8PCMZUVxuGstmmgQzEdif

Author: andiwand

CHANGELOG.md

@@ -40,6 +40,9 @@ The release run heads these entries with the version and opens a fresh
 - A pdf page is the size of its crop box and shows what is on it and no more,
   as a viewer shows it.
 - A pdf's JPEG 2000 images render. New dependency: `openjpeg`.
+- A frame anchored to the page sits where the page says, whatever the text
+  around it wraps like - a letter's address and date boxes land in their fields
+  instead of in the running text.
 
 ## v6.5.0 - 2026-08-10
 

src/odr/internal/html/document_style.cpp

@@ -422,13 +422,18 @@ std::string html::translate_frame_properties(const Frame &frame) {
     horizontal_position = *style.horizontal_position;
   }
 
+  // A frame anchored to the page sits at its own place on it, whatever the text
+  // around it does; only one anchored in the text takes its place from the
+  // wrap.
+  const AnchorType anchor_type = frame.anchor_type();
+  const bool in_text = anchor_type != AnchorType::at_page;
+
   // The frame is what its image sizes against.
   std::string result;
-  if (const AnchorType anchor_type = frame.anchor_type();
-      anchor_type == AnchorType::as_char) {
+  if (anchor_type == AnchorType::as_char) {
     result += "position:relative;";
     result += "display:inline-block;";
-  } else if (text_wrap == TextWrap::before) {
+  } else if (in_text && text_wrap == TextWrap::before) {
     result += "position:relative;";
     result += "display:block;";
     result += "float:right;clear:both;";
@@ -446,7 +451,7 @@ std::string html::translate_frame_properties(const Frame &frame) {
       result += width->to_string();
       result += ");";
     }
-  } else if (text_wrap == TextWrap::after) {
+  } else if (in_text && text_wrap == TextWrap::after) {
     result += "position:relative;";
     result += "display:block;";
     result += "float:left;clear:both;";
@@ -457,7 +462,7 @@ std::string html::translate_frame_properties(const Frame &frame) {
     if (const std::optional<Measure> y = frame.y(); y.has_value()) {
       result += "margin-top:" + y->to_string() + ";";
     }
-  } else if (text_wrap == TextWrap::none) {
+  } else if (in_text && text_wrap == TextWrap::none) {
     result += "position:relative;";
     result += "display:block;";
     if (const std::optional<Measure> x = frame.x(); x.has_value()) {