diff --git a/CHANGES.md b/CHANGES.md
index 2fe3fdab6..5a3dc0455 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -21,6 +21,8 @@ libcups v3.0rc1 (TBD)
 - Updated the various tool man pages, usage output, and examples.
 - Updated `ippCreateRequestedArray` for the Get-Documents and
   Get-Output-Device-Attributes operations.
+- Updated `ipptool` to validate IPP, PDF, and .strings files using the
+  "WITH-[ALL-]CONTENT" predicate (Issue #87)
 - Now use installed PDFio library, if available.
 - Now use NotoSansMono font for `ipptransform` text conversions.
 - Brought back IPP/2.x and related conformance test files (Issue #85)
diff --git a/examples/Makefile b/examples/Makefile
index 3c6e32233..85fd31236 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -85,7 +85,8 @@ TESTFILES	=	\
 			rfc3995-3996.test \
 			rfc3998.test \
 			set-attrs-hold.test \
-			validate-job.test
+			validate-job.test \
+			validate-resources.test
 
 
 #
diff --git a/examples/validate-resources.test b/examples/validate-resources.test
new file mode 100644
index 000000000..7bd5849ac
--- /dev/null
+++ b/examples/validate-resources.test
@@ -0,0 +1,29 @@
+# Validate printer resources
+{
+    NAME "Validate Printer Resources"
+    OPERATION Get-Printer-Attributes
+    GROUP operation-attributes-tag
+    ATTR charset attributes-charset utf-8
+    ATTR language attributes-natural-language en
+    ATTR uri printer-uri $uri
+    ATTR name requesting-user-name $user
+
+    STATUS successful-ok
+
+    EXPECT ?printer-charge-info-uri OF-TYPE uri IN-GROUP printer-attributes-tag COUNT 1 WITH-CONTENT valid
+
+    EXPECT printer-icc-profiles OF-TYPE collection IN-GROUP printer-attributes-tag DEFINE-MATCH PRINTER_HAS_ICC_PROFILES
+    EXPECT printer-icc-profiles/profile-uri OF-TYPE uri COUNT 1 WITH-CONTENT valid IF-DEFINED PRINTER_HAS_ICC_PROFILES
+
+    EXPECT ?printer-icons OF-TYPE uri IN-GROUP printer-attributes-tag WITH-ALL-CONTENT valid-icon
+
+    EXPECT ?printer-more-info OF-TYPE uri IN-GROUP printer-attributes-tag COUNT 1 WITH-CONTENT valid
+
+    EXPECT ?printer-more-info-manufacturer OF-TYPE uri IN-GROUP printer-attributes-tag COUNT 1 WITH-CONTENT valid
+
+    EXPECT ?printer-privacy-policy-uri OF-TYPE uri IN-GROUP printer-attributes-tag COUNT 1 WITH-CONTENT valid
+
+    EXPECT ?printer-static-resource-directory-uri OF-TYPE uri IN-GROUP printer-attributes-tag COUNT 1 WITH-CONTENT valid
+
+    EXPECT ?printer-strings-uri OF-TYPE uri IN-GROUP printer-attributes-tag COUNT 1 WITH-CONTENT valid
+}
diff --git a/man/ipptool.1 b/man/ipptool.1
index 49b5c5cda..83a5292d2 100644
--- a/man/ipptool.1
+++ b/man/ipptool.1
@@ -1,13 +1,13 @@
 .\"
 .\" ipptool man page.
 .\"
-.\" Copyright © 2021-2023 by OpenPrinting.
+.\" Copyright © 2021-2024 by OpenPrinting.
 .\" Copyright © 2010-2019 by Apple Inc.
 .\"
 .\" Licensed under Apache License v2.0.  See the file "LICENSE" for more
 .\" information.
 .\"
-.TH ipptool 1 "CUPS" "2023-11-22" "OpenPrinting"
+.TH ipptool 1 "CUPS" "2024-09-12" "OpenPrinting"
 .SH NAME
 ipptool \- perform internet printing protocol requests
 .SH SYNOPSIS
@@ -227,6 +227,8 @@ The following standard test files are available:
     identify\-printer\-display.test     - Identify a printer via the display
     ipp\-1.1.test                      - Run IPP/1.1 conformance tests
     ipp\-2.0.test                      - Run IPP/2.0 conformance tests
+    ipp\-2.1.test                      - Run IPP/2.1 conformance tests
+    ipp\-2.2.test                      - Run IPP/2.2 conformance tests
     print\-job.test                    - Print a file
     print\-job\-and\-wait.test           - Print a file and wait for completion
     print\-job\-deflate.test            - Print a file with deflate compression
@@ -239,8 +241,21 @@ The following standard test files are available:
     print\-job\-password.test           - Print a file with a password/PIN
     print\-job\-raster.test             - Print a generated raster file
     print\-uri.test                    - Print a URI/URL
+    pwg5100.1.test                    - Test PWG 5100.1 (Finishings) conformance
+    pwg5100.2.test                    - Test PWG 5100.2 (output-bin) conformance
+    pwg5100.3.test                    - Test PWG 5100.3 (Production) conformance
+    pwg5100.5.test                    - Test PWG 5100.5 (Document Object) conformance
+    pwg5100.6.test                    - Test PWG 5100.6 (Page Overrides) conformance
+    pwg5100.7.test                    - Test PWG 5100.7 (Job Extensions) conformance
+    pwg5100.8.test                    - Test PWG 5100.8 (-actuals) conformance
+    pwg5100.9.test                    - Test PWG 5100.9 (Alerts) conformance
+    pwg5100.11.test                   - Test PWG 5100.11 (Enterprise) conformance
+    rfc3380.test                      - Test RFC 3380 (Job and Printer Set) conformance
+    rfc3995-3996.test                 - Test RFC 3995/3996 (Notifications) conformance
+    rfc3998.test                      - Test RFC 3998 (Admin) conformance
     set\-attrs\-hold.test               - Test setting job-hold-until to hold a job
     validate\-job.test                 - Validate a job ticket
+    validate\-resources.test           - Validate printer resource files and web pages
 .fi
 .PP
 The following standard document files are available:
@@ -287,4 +302,4 @@ IANA IPP Registry (https://www.iana.org/assignments/ipp\-registrations),
 PWG Internet Printing Protocol Workgroup (https://www.pwg.org/ipp),
 RFC 8011 (https://datatracker.ietf.org/doc/html/rfc8011)
 .SH COPYRIGHT
-Copyright \[co] 2021-2023 by OpenPrinting.
+Copyright \[co] 2021-2024 by OpenPrinting.
diff --git a/man/ipptoolfile.5 b/man/ipptoolfile.5
index fa8ca5acf..1bf9e0182 100644
--- a/man/ipptoolfile.5
+++ b/man/ipptoolfile.5
@@ -1,13 +1,13 @@
 .\"
 .\" ipptoolfile man page.
 .\"
-.\" Copyright © 2021-2023 by OpenPrinting.
+.\" Copyright © 2021-2024 by OpenPrinting.
 .\" Copyright © 2010-2021 by Apple Inc.
 .\"
 .\" Licensed under Apache License v2.0.  See the file "LICENSE" for more
 .\" information.
 .\"
-.TH ipptoolfile 5 "CUPS" "2023-11-17" "OpenPrinting"
+.TH ipptoolfile 5 "CUPS" "2024-09-12" "OpenPrinting"
 .SH NAME
 ipptoolfile \- ipptool file format
 .SH DESCRIPTION
@@ -352,6 +352,9 @@ A "http" or "https" URI must respond to a GET request while a "ipp" or "ipps" UR
 .TP 5
 \fBWITH\-CONTENT valid\fR
 Requires that all "http" and "https" URI values be accessible and provide valid content.
+Currently
+.B ipptool
+is able to validate CSS, HTML, ICC, IPP, JPEG, PDF, PNG, and Apple .strings files.
 .TP 5
 \fBWITH\-ALL\-CONTENT valid-icon\fR
 .TP 5
@@ -886,4 +889,4 @@ PWG 5101.1-2023: PWG Media Standardized Names v2.1 (https://ftp.pwg.org/pub/pwg/
 .PP
 RFC 8011 (https://datatracker.ietf.org/doc/html/rfc8011)
 .SH COPYRIGHT
-Copyright \[co] 2021-2023 by OpenPrinting.
+Copyright \[co] 2021-2024 by OpenPrinting.
diff --git a/pdfio b/pdfio
index 206f75403..986c5f043 160000
--- a/pdfio
+++ b/pdfio
@@ -1 +1 @@
-Subproject commit 206f75403a085c6bf2033f8e2c0eae2c81ac4e82
+Subproject commit 986c5f0438ea71f549244b841c3775d94659849a
diff --git a/tools/Makefile b/tools/Makefile
index 303d82952..6e9ecee5d 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -172,7 +172,7 @@ ippfind-static:	ippfind.o ../cups/$(LIBCUPS_STATIC)
 
 ipptool:	ipptool.o ../cups/$(LIBCUPS) ipptool-static
 	echo Linking $@...
-	$(CC) $(LDFLAGS) $(OPTIM) -o $@ ipptool.o $(LINKCUPS) $(LIBS)
+	$(CC) $(LDFLAGS) $(OPTIM) -o $@ ipptool.o $(LINKCUPS) $(XFORMLIBS) $(LIBS)
 	$(CODE_SIGN) $(CSFLAGS) $@
 
 
@@ -182,7 +182,7 @@ ipptool:	ipptool.o ../cups/$(LIBCUPS) ipptool-static
 
 ipptool-static:	ipptool.o ../cups/$(LIBCUPS_STATIC)
 	echo Linking $@...
-	$(CC) $(LDFLAGS) $(OPTIM) -o $@ ipptool.o ../cups/$(LIBCUPS_STATIC) $(LIBS)
+	$(CC) $(LDFLAGS) $(OPTIM) -o $@ ipptool.o ../cups/$(LIBCUPS_STATIC) $(XFORMLIBS) $(LIBS)
 	$(CODE_SIGN) $(CSFLAGS) $@
 
 
diff --git a/tools/ipptool.c b/tools/ipptool.c
index 653647704..b6aa1ff2e 100644
--- a/tools/ipptool.c
+++ b/tools/ipptool.c
@@ -1,7 +1,7 @@
 //
 // ipptool command for CUPS.
 //
-// Copyright © 2021-2023 by OpenPrinting.
+// Copyright © 2021-2024 by OpenPrinting.
 // Copyright © 2020 by The Printer Working Group.
 // Copyright © 2007-2021 by Apple Inc.
 // Copyright © 1997-2007 by Easy Software Products.
@@ -26,6 +26,7 @@
 #ifndef O_BINARY
 #  define O_BINARY 0
 #endif // !O_BINARY
+#include <pdfio.h>
 
 
 //
@@ -238,6 +239,7 @@ static bool	parse_generate_file(ipp_file_t *f, ipptool_test_t *data);
 static bool	parse_monitor_printer_state(ipp_file_t *f, ipptool_test_t *data);
 static const char *password_cb(const char *prompt, http_t *http, const char *method, const char *resource, void *user_data);
 static void	pause_message(const char *message);
+static bool	pdf_error_cb(pdfio_file_t *pdf, const char *message, cups_array_t *errors);
 static void	print_attr(cups_file_t *outfile, ipptool_output_t output, ipp_attribute_t *attr, ipp_tag_t *group);
 static ipp_attribute_t *print_csv(ipptool_test_t *data, ipp_t *ipp, ipp_attribute_t *attr, int num_displayed, char **displayed, size_t *widths);
 static void	print_fatal_error(ipptool_test_t *data, const char *s, ...) _CUPS_FORMAT(2, 3);
@@ -4121,6 +4123,23 @@ pause_message(const char *message)	// I - Message
 }
 
 
+//
+// 'pdf_error_cb()' - PDFio error callback.
+//
+
+static bool				// O - `false` to stop loading
+pdf_error_cb(pdfio_file_t *pdf,		// I - PDF file
+             const char   *message,	// I - Error message
+             cups_array_t *errors)	// I - Array of error messages
+{
+  (void)pdf;
+
+  add_stringf(errors, "Unable to open PDF file: %s", message);
+
+  return (false);
+}
+
+
 //
 // 'print_attr()' - Print an attribute on the screen.
 //
@@ -6700,7 +6719,8 @@ with_content(
   char		scheme[256],		// Scheme
 		userpass[256],		// Username:password (not used)
 		host[256],		// Hostname
-		resource[256];		// Resource path
+		resource[256],		// Resource path
+		*resptr;		// Pointer into resource
   int		port;			// Port number
   http_encryption_t encryption;		// Encryption  mode
   http_uri_status_t uri_status;		// URI decoding status
@@ -6720,6 +6740,9 @@ with_content(
       continue;
     }
 
+    if ((resptr = strchr(resource, '#')) != NULL)
+      *resptr = '\0';			// Strip HTML target ("...#target")
+
     if (strcmp(scheme, "http") && strcmp(scheme, "https") && strcmp(scheme, "ipp") && strcmp(scheme, "ipps"))
     {
       add_stringf(errors, "Unsupported URI scheme for '%s'.", uri);
@@ -6789,7 +6812,7 @@ with_content(
 
       if (status != HTTP_STATUS_OK)
       {
-        add_stringf(errors, "Got unexpected status %d for HEAD request to '%s'.", (int)status, uri);
+        add_stringf(errors, "Got unexpected status %d for GET request to '%s'.", (int)status, uri);
         ret = false;
         goto get_done;
       }
@@ -6833,14 +6856,70 @@ with_content(
       }
       else if (!_cups_strcasecmp(content_type, "image/jpeg") || !_cups_strcasecmp(content_type, "image/png"))
       {
+        // Validate image content
         if (!valid_image(filename, &width, &height, &depth))
         {
-	  add_stringf(errors, "Unable to load image '%s'.", uri);
+	  add_stringf(errors, "Unable to open image '%s'.", uri);
 	  ret = false;
 	  goto get_done;
         }
       }
-      else if (!_cups_strcasecmp(content_type, "application/pdf") || !_cups_strcasecmp(content_type, "application/ipp") || !_cups_strcasecmp(content_type, "application/vnd.iccprofile") || !_cups_strcasecmp(content_type, "text/css") || !_cups_strcasecmp(content_type, "text/html") || !_cups_strcasecmp(content_type, "text/strings"))
+      else if (!_cups_strcasecmp(content_type, "text/strings"))
+      {
+        // Validate .strings content...
+        cups_lang_t	*lang;		// Temporary language
+
+        if ((lang = cupsLangFind("zz")) == NULL)
+        {
+          add_stringf(errors, "Unable to validate '%s'.", uri);
+          ret = false;
+          goto get_done;
+        }
+
+        if (!cupsLangLoadStrings(lang, filename, /*strings*/NULL))
+        {
+          add_stringf(errors, "Unable to open '%s': %s", uri, cupsGetErrorString());
+          ret = false;
+          goto get_done;
+        }
+       }
+      else if (!_cups_strcasecmp(content_type, "application/pdf"))
+      {
+        // Validate PDF content...
+        pdfio_file_t	*pdf;		// PDF file
+
+        if ((pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_data*/NULL, (pdfio_error_cb_t)pdf_error_cb, errors)) == NULL)
+        {
+          ret = false;
+          goto get_done;
+        }
+
+        pdfioFileClose(pdf);
+      }
+      else if (!_cups_strcasecmp(content_type, "application/ipp"))
+      {
+        ipp_t	*ipp = ippNew();	// IPP message
+
+        if ((fd = open(filename, O_RDONLY | O_BINARY)) < 0)
+        {
+          add_stringf(errors, "Unable to open '%s': %s", uri, strerror(errno));
+          ippDelete(ipp);
+          ret = false;
+          goto get_done;
+        }
+        else if (ippReadFile(fd, ipp) != IPP_STATE_DATA)
+        {
+          add_stringf(errors, "Unable to read '%s': %s", uri, cupsGetErrorString());
+          ippDelete(ipp);
+          close(fd);
+          ret = false;
+          goto get_done;
+        }
+
+	ippDelete(ipp);
+	close(fd);
+      }
+      else if (!_cups_strcasecmp(content_type, "application/vnd.iccprofile") || !_cups_strcasecmp(content_type, "text/css") || !_cups_strcasecmp(content_type, "text/html") || !_cups_strncasecmp(content_type, "text/html;", 10))
       {
         // Just require these files to be non-empty for now, might add more checks in the future...
         if (fileinfo.st_size == 0)
@@ -6852,7 +6931,7 @@ with_content(
       }
       else
       {
-	add_stringf(errors, "Got unexpected Content-Type '%s' for HEAD request to '%s'.", content_type, uri);
+	add_stringf(errors, "Got unexpected Content-Type '%s' for GET request to '%s'.", content_type, uri);
 	ret = false;
 	goto get_done;
       }