adding text-decoration-skip-ink: none to reftests

Browsers who already have text-decoration-skip-ink implemented will currently
fail [or spuriously pass] these tests because the feature is on by default and
the Ahem font is "ink-heavy", causing underlines and overlines to not show up
at all. The added text-decoration-skip-ink: none; line will ensure that an
underline or overline will be rendered whether or not skip-ink has been
implemented.

Differential Revision: https://phabricator.services.mozilla.com/D38949

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1567643
gecko-commit: 84ff6397982d0f5b5824eea3120ea7091bb3482f
gecko-integration-branch: autoland
gecko-reviewers: dholbert
diff --git a/css/css-text-decor/reference/text-decoration-thickness-001-notref.html b/css/css-text-decor/reference/text-decoration-thickness-001-notref.html
index f876afa..4e7db88 100644
--- a/css/css-text-decor/reference/text-decoration-thickness-001-notref.html
+++ b/css/css-text-decor/reference/text-decoration-thickness-001-notref.html
@@ -10,6 +10,7 @@
         }
         div span {
             text-decoration: green underline;
+            text-decoration-skip-ink: none;
             font: 20px/1 Ahem;
             color: transparent;
             padding-right: 1em;
diff --git a/css/css-text-decor/reference/text-underline-offset-001-notref.html b/css/css-text-decor/reference/text-underline-offset-001-notref.html
index c56078a..8b1dacf 100644
--- a/css/css-text-decor/reference/text-underline-offset-001-notref.html
+++ b/css/css-text-decor/reference/text-underline-offset-001-notref.html
@@ -10,6 +10,7 @@
         }
         div span {
             text-decoration: green underline;
+            text-decoration-skip-ink: none;
             font: 20px/1 Ahem;
             color: transparent;
             padding-bottom: 20px;
diff --git a/css/css-text-decor/reference/text-underline-offset-002-ref.html b/css/css-text-decor/reference/text-underline-offset-002-ref.html
index ed2e3ce..6e7d5a6 100644
--- a/css/css-text-decor/reference/text-underline-offset-002-ref.html
+++ b/css/css-text-decor/reference/text-underline-offset-002-ref.html
@@ -10,6 +10,7 @@
         }
         #text, #norm{
             text-decoration: green underline;
+            text-decoration-skip-ink: none;
             text-underline-offset: 0px;
             font: 20px/1 Ahem;
             color: transparent;
diff --git a/css/css-text-decor/text-decoration-thickness-linethrough-001.html b/css/css-text-decor/text-decoration-thickness-linethrough-001.html
index 37e954b..6fd8383 100644
--- a/css/css-text-decor/text-decoration-thickness-linethrough-001.html
+++ b/css/css-text-decor/text-decoration-thickness-linethrough-001.html
@@ -18,6 +18,7 @@
             font: 20px/1 Ahem;
             color: transparent;
             text-decoration: green line-through;
+            text-decoration-skip-ink: none;
             /* We make the text decoration just a bit thicker than the div's height, so that
              * it will entirely cover the div's content-box (making it fully green) as long
              * as the line-through is approximately centered, vertically.
diff --git a/css/css-text-decor/text-underline-offset-001.html b/css/css-text-decor/text-underline-offset-001.html
index bd9a29c..f7aeb54 100644
--- a/css/css-text-decor/text-underline-offset-001.html
+++ b/css/css-text-decor/text-underline-offset-001.html
@@ -15,6 +15,7 @@
         }
         div span {
             text-decoration: green underline;
+            text-decoration-skip-ink: none;
             font: 20px/1 Ahem;
             color: transparent;
             padding-bottom: 20px;
diff --git a/css/css-text-decor/text-underline-offset-002.html b/css/css-text-decor/text-underline-offset-002.html
index 7441ff9..dc65db7 100644
--- a/css/css-text-decor/text-underline-offset-002.html
+++ b/css/css-text-decor/text-underline-offset-002.html
@@ -14,6 +14,7 @@
         }
         #text, #norm{
             text-decoration: green underline;
+            text-decoration-skip-ink: none;
             font: 20px/1 Ahem;
             color: transparent;
             position: relative;