Support footnotes

docs/api_reference.rst

@@ -391,16 +391,19 @@ to their position in the document:
 You can also use `running elements`_ to put HTML boxes into the page margins
 (but the ``start`` parameter of ``element()`` is not supported).
 
-The other features of GCPM are **not** implemented:
+Footnotes_ are supported. You can put a box in the footnote area using the
+``float: footnote`` property. Footnote markers and footnote calls can be
+defined using the ``::footnote-marker`` and ``::footnote-call``
+pseudo-elements. You can also change the way footnotes are displayed using the
+``footnote-display`` property (``compact`` is not supported), and influence
+over the rendering of difficult pages with ``footnote-policy``.
 
-- footnotes (``float: footnote``, ``footnote-display``, ``footnote`` counter,
-  ``::footnote-call``, ``::footnote-marker``, ``@footnote`` rule,
-  ``footnote-policy``);
-- page groups (``:nth(X of pagename)`` pseudo-class).
+Page groups (``:nth(X of pagename)`` pseudo-class) are not supported.
 
 .. _CSS Generated Content for Paged Media Module: http://www.w3.org/TR/css-gcpm-3/
 .. _Page selectors: https://www.w3.org/TR/css-gcpm-3/#document-page-selectors
 .. _running elements: https://www.w3.org/TR/css-gcpm-3/#running-elements
+.. _Footnotes: https://www.w3.org/TR/css-gcpm-3/#footnotes
 
 CSS Generated Content Module Level 3
 ++++++++++++++++++++++++++++++++++++

tests/draw/test_footnotes.py

@@ -0,0 +1,134 @@
+"""
+    weasyprint.tests.test_draw.test_footnotes
+    -----------------------------------------
+
+    Test how footnotes are drawn.
+
+"""
+
+from ..testing_utils import assert_no_logs
+from . import assert_pixels
+
+
+@assert_no_logs
+def test_inline_footnote():
+    assert_pixels('span_footnote', 9, 7, '''
+        RRRRRRRR_
+        RRRRRRRR_
+        _________
+        _________
+        _________
+        RRRRRRRR_
+        RRRRRRRR_
+    ''', '''
+    <style>
+        @font-face {src: url(weasyprint.otf); font-family: weasyprint}
+        @page {
+            size: 9px 7px;
+            background: white;
+        }
+        div {
+            color: red;
+            font-family: weasyprint;
+            font-size: 2px;
+            line-height: 1;
+        }
+        span {
+            float: footnote;
+        }
+    </style>
+    <div>abc<span>de</span></div>''')
+
+
+@assert_no_logs
+def test_block_footnote():
+    assert_pixels('div_footnote', 9, 7, '''
+        RRRRRRRR_
+        RRRRRRRR_
+        _________
+        _________
+        _________
+        RRRRRRRR_
+        RRRRRRRR_
+    ''', '''
+    <style>
+        @font-face {src: url(weasyprint.otf); font-family: weasyprint}
+        @page {
+            size: 9px 7px;
+            background: white;
+        }
+        div {
+            color: red;
+            font-family: weasyprint;
+            font-size: 2px;
+            line-height: 1;
+        }
+        div.footnote {
+            float: footnote;
+        }
+    </style>
+    <div>abc<div class="footnote">de</div></div>''')
+
+
+@assert_no_logs
+def test_long_footnote():
+    assert_pixels('long_footnote', 9, 7, '''
+        RRRRRRRR_
+        RRRRRRRR_
+        _________
+        RRRRRRRR_
+        RRRRRRRR_
+        RR_______
+        RR_______
+    ''', '''
+    <style>
+        @font-face {src: url(weasyprint.otf); font-family: weasyprint}
+        @page {
+            size: 9px 7px;
+            background: white;
+        }
+        div {
+            color: red;
+            font-family: weasyprint;
+            font-size: 2px;
+            line-height: 1;
+        }
+        span {
+            float: footnote;
+        }
+    </style>
+    <div>abc<span>de f</span></div>''')
+
+
+@assert_no_logs
+def test_footnote_margin():
+    assert_pixels('footnote_margin', 9, 7, '''
+        RRRRRRRR_
+        RRRRRRRR_
+        _________
+        _________
+        _RRRRRR__
+        _RRRRRR__
+        _________
+    ''', '''
+    <style>
+        @font-face {src: url(weasyprint.otf); font-family: weasyprint}
+        @page {
+            size: 9px 7px;
+            background: white;
+
+            @footnote {
+                margin: 1px;
+            }
+        }
+        div {
+            color: red;
+            font-family: weasyprint;
+            font-size: 2px;
+            line-height: 1;
+        }
+        span {
+            float: footnote;
+        }
+    </style>
+    <div>abc<span>d</span></div>''')

tests/layout/test_block.py

@@ -708,7 +708,7 @@ def test_box_decoration_break_slice_bottom_padding():  # pragma: no cover
     # break between a parent and its last child, put last child on next page.
     # TODO: at the end of block_container_layout, we should check that the box
     # with its bottom border/padding doesn't cross the bottom line. If it does,
-    # we should re-render the box with a max_position_y including the bottom
+    # we should re-render the box with a bottom_space including the bottom
     # border/padding.
     page_1, page_2 = render_pages('''
       <style>