add ISO and JIS paper sizes

- some were missing from the ones already required by [css-page](https://drafts.csswg.org/css-page-3/#typedef-page-size-page-size)
- the rest has been proposed for addition in https://github.com/w3c/csswg-drafts/issues/4722
- complete ISO 216 A, B and C series
- JIS P 0202 B series

weasyprint/css/computed_values.py

@@ -81,6 +81,26 @@ FONT_WEIGHT_RELATIVE = dict(
 # http://www.w3.org/TR/css3-page/#size
 # name=(width in pixels, height in pixels)
 PAGE_SIZES = dict(
+    a10=(
+        Dimension(26, 'mm'),
+        Dimension(37, 'mm'),
+    ),
+    a9=(
+        Dimension(37, 'mm'),
+        Dimension(52, 'mm'),
+    ),
+    a8=(
+        Dimension(52, 'mm'),
+        Dimension(74, 'mm'),
+    ),
+    a7=(
+        Dimension(74, 'mm'),
+        Dimension(105, 'mm'),
+    ),
+    a6=(
+        Dimension(105, 'mm'),
+        Dimension(148, 'mm'),
+    ),
     a5=(
         Dimension(148, 'mm'),
         Dimension(210, 'mm'),
@@ -93,6 +113,38 @@ PAGE_SIZES = dict(
         Dimension(297, 'mm'),
         Dimension(420, 'mm'),
     ),
+    a2=(
+        Dimension(420, 'mm'),
+        Dimension(594, 'mm'),
+    ),
+    a1=(
+        Dimension(594, 'mm'),
+        Dimension(841, 'mm'),
+    ),
+    a0=(
+        Dimension(841, 'mm'),
+        Dimension(1189, 'mm'),
+    ),
+    b10=(
+        Dimension(31, 'mm'),
+        Dimension(44, 'mm'),
+    ),
+    b9=(
+        Dimension(44, 'mm'),
+        Dimension(62, 'mm'),
+    ),
+    b8=(
+        Dimension(62, 'mm'),
+        Dimension(88, 'mm'),
+    ),
+    b7=(
+        Dimension(88, 'mm'),
+        Dimension(125, 'mm'),
+    ),
+    b6=(
+        Dimension(125, 'mm'),
+        Dimension(176, 'mm'),
+    ),
     b5=(
         Dimension(176, 'mm'),
         Dimension(250, 'mm'),
@@ -101,6 +153,110 @@ PAGE_SIZES = dict(
         Dimension(250, 'mm'),
         Dimension(353, 'mm'),
     ),
+    b3=(
+        Dimension(353, 'mm'),
+        Dimension(500, 'mm'),
+    ),
+    b2=(
+        Dimension(500, 'mm'),
+        Dimension(707, 'mm'),
+    ),
+    b1=(
+        Dimension(707, 'mm'),
+        Dimension(1000, 'mm'),
+    ),
+    b0=(
+        Dimension(1000, 'mm'),
+        Dimension(1414, 'mm'),
+    ),
+    c10=(
+        Dimension(28, 'mm'),
+        Dimension(40, 'mm'),
+    ),
+    c9=(
+        Dimension(40, 'mm'),
+        Dimension(57, 'mm'),
+    ),
+    c8=(
+        Dimension(57, 'mm'),
+        Dimension(81, 'mm'),
+    ),
+    c7=(
+        Dimension(81, 'mm'),
+        Dimension(114, 'mm'),
+    ),
+    c6=(
+        Dimension(114, 'mm'),
+        Dimension(162, 'mm'),
+    ),
+    c5=(
+        Dimension(162, 'mm'),
+        Dimension(229, 'mm'),
+    ),
+    c4=(
+        Dimension(229, 'mm'),
+        Dimension(324, 'mm'),
+    ),
+    c3=(
+        Dimension(324, 'mm'),
+        Dimension(458, 'mm'),
+    ),
+    c2=(
+        Dimension(458, 'mm'),
+        Dimension(648, 'mm'),
+    ),
+    c1=(
+        Dimension(648, 'mm'),
+        Dimension(917, 'mm'),
+    ),
+    c0=(
+        Dimension(917, 'mm'),
+        Dimension(1297, 'mm'),
+    ),
+    jis-b10=(
+        Dimension(32, 'mm'),
+        Dimension(45, 'mm'),
+    ),
+    jis-b9=(
+        Dimension(45, 'mm'),
+        Dimension(64, 'mm'),
+    ),
+    jis-b8=(
+        Dimension(64, 'mm'),
+        Dimension(91, 'mm'),
+    ),
+    jis-b7=(
+        Dimension(91, 'mm'),
+        Dimension(128, 'mm'),
+    ),
+    jis-b6=(
+        Dimension(128, 'mm'),
+        Dimension(182, 'mm'),
+    ),
+    jis-b5=(
+        Dimension(182, 'mm'),
+        Dimension(257, 'mm'),
+    ),
+    jis-b4=(
+        Dimension(257, 'mm'),
+        Dimension(364, 'mm'),
+    ),
+    jis-b3=(
+        Dimension(364, 'mm'),
+        Dimension(515, 'mm'),
+    ),
+    jis-b2=(
+        Dimension(515, 'mm'),
+        Dimension(728, 'mm'),
+    ),
+    jis-b1=(
+        Dimension(728, 'mm'),
+        Dimension(1030, 'mm'),
+    ),
+    jis-b0=(
+        Dimension(1030, 'mm'),
+        Dimension(1456, 'mm'),
+    ),
     letter=(
         Dimension(8.5, 'in'),
         Dimension(11, 'in'),