Revert "[DOM:Base] Interpret empty margin string as a zero root"

This reverts commit c89bbcef39fb605460edc2f8d3b447eff72b074d.

1 files changed, 1 insertions, 8 deletions

diff --git a/dom/base/DOMIntersectionObserver.cpp b/dom/base/DOMIntersectionObserver.cpp
index 1d236c23e..bc8f030d0 100644
--- a/dom/base/DOMIntersectionObserver.cpp
+++ b/dom/base/DOMIntersectionObserver.cpp
@@ -118,14 +118,7 @@ DOMIntersectionObserver::SetRootMargin(const nsAString& aString)
   // mode so that pixel/percent and unit-less values will be differentiated.
   nsCSSParser parser(nullptr);
   nsCSSValue value;
-
-  // Use a zero margin if the input string is empty after trimming whitespace
-  const nsAString& stringNoWS =
-    nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespaceOrNBSP>(aString, true);
-  if (stringNoWS.IsEmpty()) {
-    nsCSSRect& zeroRootMargin = value.SetRectValue();
-    zeroRootMargin.SetAllSidesTo(nsCSSValue(0.0f, eCSSUnit_Pixel));
-  } else if (!parser.ParseMarginString(aString, nullptr, 0, value, true)) {
+  if (!parser.ParseMarginString(aString, nullptr, 0, value, true)) {
     return false;
   }