diff --git a/doc/images/valid-html401.png b/doc/images/valid-html401.png
new file mode 100644
index 0000000000..c0108424a5
Binary files /dev/null and b/doc/images/valid-html401.png differ
diff --git a/libs/compatibility b/libs/compatibility
index 49cd137691..2c3978f4fa 160000
--- a/libs/compatibility
+++ b/libs/compatibility
@@ -1 +1 @@
-Subproject commit 49cd137691f0acbf4614f4bc63fa6f0d83d8b0cd
+Subproject commit 2c3978f4faa63e6d895be3a72d2b3c1768e1478b
diff --git a/libs/disjoint_sets b/libs/disjoint_sets
index cbaba3cccb..46557b62d1 160000
--- a/libs/disjoint_sets
+++ b/libs/disjoint_sets
@@ -1 +1 @@
-Subproject commit cbaba3cccba2d911d26acfd029af9ae392d22b1d
+Subproject commit 46557b62d1decbbda58fbd846b7cd12384269f2b
diff --git a/libs/format b/libs/format
index fb6c27612a..e935b0ebe3 160000
--- a/libs/format
+++ b/libs/format
@@ -1 +1 @@
-Subproject commit fb6c27612a914bdfad2e56ff1eeae06ab930d8aa
+Subproject commit e935b0ebe3dfeca72eda252ab8cb8f28cbfb65ac
diff --git a/libs/functional b/libs/functional
index a0a96229c8..6c28028f99 160000
--- a/libs/functional
+++ b/libs/functional
@@ -1 +1 @@
-Subproject commit a0a96229c8cfce4a76e3398b6a1b33cb122bacf2
+Subproject commit 6c28028f996a0ffe64f6d68a3841b047477e2368
diff --git a/libs/numeric/interval b/libs/numeric/interval
index 30bd0eab64..76acf35ec0 160000
--- a/libs/numeric/interval
+++ b/libs/numeric/interval
@@ -1 +1 @@
-Subproject commit 30bd0eab6440ca76e54898a727d6f473e6eaca7d
+Subproject commit 76acf35ec0d7e206299ffd78fd3ea5ca35cf493d
diff --git a/libs/pool b/libs/pool
index 6426fe09f8..17cfa03dcc 160000
--- a/libs/pool
+++ b/libs/pool
@@ -1 +1 @@
-Subproject commit 6426fe09f83fd1e79a488fc190e1ca9f2540dd13
+Subproject commit 17cfa03dcc8e0909182ba12c827cb1259286a3db
diff --git a/libs/random b/libs/random
index dfabc22362..050c8adc7e 160000
--- a/libs/random
+++ b/libs/random
@@ -1 +1 @@
-Subproject commit dfabc223626cbf5831268e575b058d31cb979927
+Subproject commit 050c8adc7e104f7580345ab84d543877b1c56bae
diff --git a/libs/statechart b/libs/statechart
index e7910588d3..d8101eae53 160000
--- a/libs/statechart
+++ b/libs/statechart
@@ -1 +1 @@
-Subproject commit e7910588d3fec7aaed345e3061cb2e4578bae562
+Subproject commit d8101eae53d1e48b5cf1712a8d145d3d44e43d4e
diff --git a/libs/tokenizer b/libs/tokenizer
index 9901de0eb3..b0cf505001 160000
--- a/libs/tokenizer
+++ b/libs/tokenizer
@@ -1 +1 @@
-Subproject commit 9901de0eb384b68d0994262bf59da2b8a9ccb4f1
+Subproject commit b0cf505001a46b6a72e502e39594bc127a8c7c51
diff --git a/libs/utility b/libs/utility
index 67afd7e315..682032a340 160000
--- a/libs/utility
+++ b/libs/utility
@@ -1 +1 @@
-Subproject commit 67afd7e3150d45e5b0201cdce571ca0f4c64e191
+Subproject commit 682032a3408590bfac5aa02b50eee391ab54bf8c
diff --git a/more/writingdoc/design.html b/more/writingdoc/design.html
index 7e95a63ff0..cb47fef187 100644
--- a/more/writingdoc/design.html
+++ b/more/writingdoc/design.html
@@ -558,7 +558,7 @@
Revised
diff --git a/more/writingdoc/index.html b/more/writingdoc/index.html
index 869c590411..6514369565 100644
--- a/more/writingdoc/index.html
+++ b/more/writingdoc/index.html
@@ -39,7 +39,7 @@
Revised
diff --git a/more/writingdoc/introduction.html b/more/writingdoc/introduction.html
index 29f737bcb6..2928a9457a 100644
--- a/more/writingdoc/introduction.html
+++ b/more/writingdoc/introduction.html
@@ -50,7 +50,7 @@
Revised
diff --git a/more/writingdoc/structure.html b/more/writingdoc/structure.html
index d3783fcc9d..900f2a61a8 100644
--- a/more/writingdoc/structure.html
+++ b/more/writingdoc/structure.html
@@ -415,7 +415,7 @@ void resize(size_type n, charT c);
Revised
diff --git a/more/writingdoc/template/acknowledgments.html b/more/writingdoc/template/acknowledgments.html
index bfb9e5d28d..9a4995099c 100644
--- a/more/writingdoc/template/acknowledgments.html
+++ b/more/writingdoc/template/acknowledgments.html
@@ -30,7 +30,7 @@
Revised
diff --git a/more/writingdoc/template/bibliography.html b/more/writingdoc/template/bibliography.html
index c824b07bbf..6704847df6 100644
--- a/more/writingdoc/template/bibliography.html
+++ b/more/writingdoc/template/bibliography.html
@@ -30,7 +30,7 @@
Revised
diff --git a/more/writingdoc/template/configuration.html b/more/writingdoc/template/configuration.html
index 6eaebf015e..e32eff4c23 100644
--- a/more/writingdoc/template/configuration.html
+++ b/more/writingdoc/template/configuration.html
@@ -127,7 +127,7 @@
Revised
diff --git a/more/writingdoc/template/definitions.html b/more/writingdoc/template/definitions.html
index 25b22d580f..03fa3430c6 100644
--- a/more/writingdoc/template/definitions.html
+++ b/more/writingdoc/template/definitions.html
@@ -60,7 +60,7 @@
Revised
diff --git a/more/writingdoc/template/faq.html b/more/writingdoc/template/faq.html
index 3133faea01..7d30768fce 100644
--- a/more/writingdoc/template/faq.html
+++ b/more/writingdoc/template/faq.html
@@ -43,7 +43,7 @@
Revised
diff --git a/more/writingdoc/template/header.html b/more/writingdoc/template/header.html
index e16500de65..a0141f8933 100644
--- a/more/writingdoc/template/header.html
+++ b/more/writingdoc/template/header.html
@@ -328,7 +328,7 @@ namespace boost
Revised
diff --git a/more/writingdoc/template/index.html b/more/writingdoc/template/index.html
index e360ab3195..82fe9d95cb 100644
--- a/more/writingdoc/template/index.html
+++ b/more/writingdoc/template/index.html
@@ -108,7 +108,7 @@
Revised
diff --git a/more/writingdoc/template/overview.html b/more/writingdoc/template/overview.html
index c931bc5838..d4a443d6fa 100644
--- a/more/writingdoc/template/overview.html
+++ b/more/writingdoc/template/overview.html
@@ -61,7 +61,7 @@
Revised
diff --git a/more/writingdoc/template/rationale.html b/more/writingdoc/template/rationale.html
index bb450a092d..7ea0c9d7c3 100644
--- a/more/writingdoc/template/rationale.html
+++ b/more/writingdoc/template/rationale.html
@@ -61,7 +61,7 @@
Revised