[pull] master from mozilla:master

README.md

@@ -46,7 +46,7 @@ directory `build/chromium`.
 
 ### PDF debugger
 
-Browser the internal structure of a PDF document with https://mozilla.github.io/pdf.js/internal-viewer/web/pdf_internal_viewer.html
+Browser the internal structure of a PDF document with https://mozilla.github.io/pdf.js/internal-viewer/web/debugger.html
 
 ## Getting the Code
 

gulpfile.mjs

@@ -2372,13 +2372,13 @@ gulp.task("check_l10n", function (done) {
 
 function createInternalViewerBundle(defines) {
   const viewerFileConfig = createWebpackConfig(defines, {
-    filename: "pdf_internal_viewer.mjs",
+    filename: "debugger.mjs",
     library: {
       type: "module",
     },
   });
   return gulp
-    .src("./web/pdf_internal_viewer.js", { encoding: false })
+    .src("./web/internal/debugger.js", { encoding: false })
     .pipe(webpack2Stream(viewerFileConfig));
 }
 
@@ -2389,10 +2389,10 @@ function buildInternalViewer(defines, dir) {
     createMainBundle(defines).pipe(gulp.dest(dir + "build")),
     createWorkerBundle(defines).pipe(gulp.dest(dir + "build")),
     createInternalViewerBundle(defines).pipe(gulp.dest(dir + "web")),
-    preprocessHTML("web/pdf_internal_viewer.html", defines).pipe(
+    preprocessHTML("web/internal/debugger.html", defines).pipe(
       gulp.dest(dir + "web")
     ),
-    preprocessCSS("web/pdf_internal_viewer.css", defines)
+    preprocessCSS("web/internal/debugger.css", defines)
       .pipe(
         postcss([
           postcssDirPseudoClass(),

pdfjs.config

@@ -1,5 +1,5 @@
 {
   "stableVersion": "5.5.207",
-  "baseVersion": "025d658a9c66d10825ce19bc830e52a8c6347e61",
-  "versionPrefix": "5.5."
+  "baseVersion": "315491dd3224d957f203f813f880b26cc3251bae",
+  "versionPrefix": "5.6."
 }

src/core/worker.js

@@ -196,7 +196,6 @@ class WorkerMessageHandler {
       password,
       disableAutoFetch,
       rangeChunkSize,
-      length,
       docBaseUrl,
       enableXfa,
       evaluatorOptions,
@@ -209,7 +208,7 @@ class WorkerMessageHandler {
         enableXfa,
         evaluatorOptions,
         handler,
-        length,
+        length: 0,
         password,
         rangeChunkSize,
       };
@@ -287,14 +286,9 @@ class WorkerMessageHandler {
         }
 
         if (!newPdfManager) {
-          const pdfFile = arrayBuffersToBytes(cachedChunks);
+          pdfManagerArgs.source = arrayBuffersToBytes(cachedChunks);
           cachedChunks = null;
 
-          if (length && pdfFile.length !== length) {
-            warn("reported HTTP length is different from actual");
-          }
-          pdfManagerArgs.source = pdfFile;
-
           newPdfManager = new LocalPdfManager(pdfManagerArgs);
           resolve(newPdfManager);
         }

src/display/api.js

@@ -124,8 +124,6 @@ const RENDERING_CANCELLED_TIMEOUT = 100; // ms
  *   cross-site Access-Control requests should be made using credentials such
  *   as cookies or authorization headers. The default is `false`.
  * @property {string} [password] - For decrypting password-protected PDFs.
- * @property {number} [length] - The PDF file length. It's used for progress
- *   reports and range requests operations.
  * @property {PDFDataRangeTransport} [range] - Allows for using a custom range
  *   transport implementation.
  * @property {number} [rangeChunkSize] - Specify maximum number of bytes fetched
@@ -353,7 +351,6 @@ function getDocument(src = {}) {
   const pagesMapper = src.pagesMapper || new PagesMapper();
 
   // Parameters whose default values depend on other parameters.
-  const length = rangeTransport ? rangeTransport.length : (src.length ?? NaN);
   const useSystemFonts =
     typeof src.useSystemFonts === "boolean"
       ? src.useSystemFonts
@@ -425,7 +422,6 @@ function getDocument(src = {}) {
     password,
     disableAutoFetch,
     rangeChunkSize,
-    length,
     docBaseUrl,
     enableXfa,
     evaluatorOptions: {
@@ -497,7 +493,6 @@ function getDocument(src = {}) {
 
         networkStream = new NetworkStream({
           url,
-          length,
           httpHeaders,
           withCredentials,
           rangeChunkSize,

src/display/fetch_stream.js

@@ -86,15 +86,12 @@ class PDFFetchStreamReader extends BasePDFStreamReader {
     const {
       disableRange,
       disableStream,
-      length,
       rangeChunkSize,
       url,
       withCredentials,
     } = stream._source;
 
-    this._contentLength = length;
     this._isStreamingSupported = !disableStream;
-    this._isRangeSupported = !disableRange;
     // Always create a copy of the headers.
     const headers = new Headers(stream.headers);
 
@@ -114,10 +111,8 @@ class PDFFetchStreamReader extends BasePDFStreamReader {
             rangeChunkSize,
             disableRange,
           });
-
+        this._contentLength = contentLength;
         this._isRangeSupported = isRangeSupported;
-        // Setting right content length.
-        this._contentLength = contentLength || this._contentLength;
 
         this._filename = extractFilenameFromHeader(responseHeaders);
 

src/display/network.js

@@ -187,9 +187,6 @@ class PDFNetworkStreamReader extends BasePDFStreamReader {
 
   constructor(stream) {
     super(stream);
-    const { length } = stream._source;
-
-    this._contentLength = length;
     // Note that `XMLHttpRequest` doesn't support streaming, and range requests
     // will be enabled (if supported) in `this.#onHeadersReceived` below.
 
@@ -229,12 +226,8 @@ class PDFNetworkStreamReader extends BasePDFStreamReader {
         rangeChunkSize,
         disableRange,
       });
-
-    if (isRangeSupported) {
-      this._isRangeSupported = true;
-    }
-    // Setting right content length.
-    this._contentLength = contentLength || this._contentLength;
+    this._contentLength = contentLength;
+    this._isRangeSupported = isRangeSupported;
 
     this._filename = extractFilenameFromHeader(responseHeaders);
 

src/display/network_utils.js

@@ -50,7 +50,7 @@ function validateRangeRequestCapabilities({
     );
   }
   const rv = {
-    contentLength: undefined,
+    contentLength: 0,
     isRangeSupported: false,
   };
 

src/display/node_stream.js

@@ -62,12 +62,9 @@ class PDFNodeStreamReader extends BasePDFStreamReader {
 
   constructor(stream) {
     super(stream);
-    const { disableRange, disableStream, length, rangeChunkSize, url } =
-      stream._source;
+    const { disableRange, disableStream, rangeChunkSize, url } = stream._source;
 
-    this._contentLength = length;
     this._isStreamingSupported = !disableStream;
-    this._isRangeSupported = !disableRange;
 
     const fs = process.getBuiltinModule("fs");
     fs.promises
@@ -79,13 +76,10 @@ class PDFNodeStreamReader extends BasePDFStreamReader {
         this._reader = readableStream.getReader();
 
         const { size } = stat;
-        if (size <= 2 * rangeChunkSize) {
-          // The file size is smaller than the size of two chunks, so it doesn't
-          // make any sense to abort the request and retry with a range request.
-          this._isRangeSupported = false;
-        }
-        // Setting right content length.
         this._contentLength = size;
+        // When the file size is smaller than the size of two chunks, it doesn't
+        // make any sense to abort the request and retry with a range request.
+        this._isRangeSupported = !disableRange && size > 2 * rangeChunkSize;
 
         // We need to stop reading when range is supported and streaming is
         // disabled.

test/unit/network_utils_spec.js

@@ -153,7 +153,7 @@ describe("network_utils", function () {
         })
       ).toEqual({
         isRangeSupported: false,
-        contentLength: undefined,
+        contentLength: 0,
       });
     });
 

web/internal/canvas_context_details_view.css

@@ -0,0 +1,85 @@
+/* Copyright 2026 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+.gfx-state-section {
+  padding-inline: 12px;
+}
+
+.gfx-state-section + .gfx-state-section {
+  margin-top: 8px;
+  padding-top: 8px;
+  border-top: 1px solid var(--border-color);
+}
+
+.gfx-state-title {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 4px;
+  color: var(--accent-color);
+  font-weight: bold;
+  margin-bottom: 4px;
+}
+
+.gfx-state-stack-nav {
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  font-weight: normal;
+  font-size: 0.8em;
+}
+
+.gfx-state-stack-button {
+  padding: 0 3px;
+  border: 1px solid currentcolor;
+  border-radius: 2px;
+  background: transparent;
+  color: inherit;
+  cursor: pointer;
+  line-height: 1.3;
+
+  &:disabled {
+    cursor: default;
+    opacity: 0.35;
+  }
+}
+
+.gfx-state-stack-pos {
+  min-width: 4ch;
+  text-align: center;
+  font-variant-numeric: tabular-nums;
+}
+
+.gfx-state-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 1px 0;
+}
+
+.gfx-state-key {
+  color: var(--muted-color);
+  flex-shrink: 0;
+  min-width: 20ch;
+}
+
+.gfx-state-val {
+  color: var(--number-color);
+  flex: 1 1 0;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}