Html Font background-color

Code to support it was missing, and is now added.

Author: oleibman

src/PhpWord/Writer/HTML/Style/Font.php

@@ -73,6 +73,13 @@ public function write()
         } elseif ($style->isRTL() === false) {
             $css['direction'] = 'ltr';
         }
+        $shading = $style->getShading();
+        if ($shading !== null) {
+            $fill = $shading->getFill();
+            if (!empty($fill)) {
+                $css['background-color'] = preg_match('/^[0-9a-fA-F]{6}$/', $fill) ? "#$fill" : $fill;
+            }
+        }
 
         return $this->assembleCss($css);
     }

tests/PhpWordTests/Shared/Html2402Test.php

@@ -73,6 +73,7 @@ public function testParseTableBorder0(): void
         self::assertSame($expected, $count);
         $substring2 = 'border-top-style: dotted; border-top-color: #FF0000; border-left-style: dotted; border-left-color: #FF0000; border-bottom-style: dotted; border-bottom-color: #FF0000; border-right-style: dotted; border-right-color: #FF0000;';
         self::assertSame(1, substr_count($content, $substring2));
+        self::assertStringContainsString('style="background-color: #00FF00;">header c</span>', $content);
     }
 
     public function testParseTableStyleBorderNone(): void