From 4a374e5b99c793b953505af632eb8232b82adee4 Mon Sep 17 00:00:00 2001
From: Timothy Gu <timothygu99@gmail.com>
Date: Tue, 7 Jan 2020 13:15:03 -0800
Subject: [PATCH] Clean up _defaultStepBase in <input>

Restore to the original HTML definition of nonexistent for anything
other than type=week.
---
 lib/jsdom/living/nodes/HTMLInputElement-impl.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/jsdom/living/nodes/HTMLInputElement-impl.js b/lib/jsdom/living/nodes/HTMLInputElement-impl.js
index 53de55e4d5..8c7335be48 100644
--- a/lib/jsdom/living/nodes/HTMLInputElement-impl.js
+++ b/lib/jsdom/living/nodes/HTMLInputElement-impl.js
@@ -848,7 +848,10 @@ class HTMLInputElementImpl extends HTMLElementImpl {
         return value;
       }
     }
-    return this._defaultStepBase;
+    if (this._defaultStepBase !== null) {
+      return this._defaultStepBase;
+    }
+    return 0;
   }
 
   // https://html.spec.whatwg.org/multipage/input.html#concept-input-step-default-base
@@ -857,7 +860,7 @@ class HTMLInputElementImpl extends HTMLElementImpl {
       // The start of week 1970-W01
       return -259200000;
     }
-    return 0;
+    return null;
   }
 
   // https://html.spec.whatwg.org/multipage/input.html#common-input-element-attributes