Draw background behind absolutely positioned replaced boxes

Author: liZe

tests/draw/test_absolute.py

@@ -770,3 +770,26 @@ def test_fixed_in_inline(assert_pixels):
         </style>
         <p>a a</p> a a <div>a</div>
     ''')
+
+
+@assert_no_logs
+def test_absolute_image_background(assert_pixels):
+    assert_pixels('''
+        ____
+        _RBB
+        _BBB
+        _BBB
+    ''', '''
+        <style>
+          @page {
+            size: 4px;
+          }
+          img {
+            background: blue;
+            position: absolute;
+            top: 1px;
+            left: 1px;
+          }
+        </style>
+        <img src="pattern-transparent.svg" />
+    ''')

tests/resources/pattern-transparent.svg

@@ -156,6 +156,7 @@ def draw_stacking_context(stream, stacking_context):
             # Point 7
             for block in [box] + stacking_context.blocks_and_cells:
                 if isinstance(block, boxes.ReplacedBox):
+                    draw_background(stream, block.background)
                     draw_border(stream, block)
                     draw_replacedbox(stream, block)
                 elif block.children: