From 1884cb637ec3b49aa0778883f0b3deb364ebf6a7 Mon Sep 17 00:00:00 2001
From: Simon Pieters <zcorpan@gmail.com>
Date: Wed, 6 Apr 2016 12:14:08 +0200
Subject: [PATCH] Make input/textarea.selection{Direction,Start,End} not throw

Return null instead of throwing InvalidStateError for
input.selectionDirection, selectionStart, and selectionEnd, when
they do not apply.

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=28225.
---
 source | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/source b/source
index 92d5204d008..0a8d52f4189 100644
--- a/source
+++ b/source
@@ -42140,9 +42140,9 @@ interface <dfn>HTMLFormElement</dfn> : <span>HTMLElement</span> {
   [SameObject] readonly attribute <span>NodeList</span> <span data-x="dom-lfe-labels">labels</span>;
 
   void <span data-x="dom-textarea/input-select">select</span>();
-  attribute unsigned long <span data-x="dom-textarea/input-selectionStart">selectionStart</span>;
-  attribute unsigned long <span data-x="dom-textarea/input-selectionEnd">selectionEnd</span>;
-  attribute DOMString <span data-x="dom-textarea/input-selectionDirection">selectionDirection</span>;
+  attribute unsigned long? <span data-x="dom-textarea/input-selectionStart">selectionStart</span>;
+  attribute unsigned long? <span data-x="dom-textarea/input-selectionEnd">selectionEnd</span>;
+  attribute DOMString? <span data-x="dom-textarea/input-selectionDirection">selectionDirection</span>;
   void <span data-x="dom-textarea/input-setRangeText">setRangeText</span>(DOMString replacement);
   void <span data-x="dom-textarea/input-setRangeText">setRangeText</span>(DOMString replacement, unsigned long start, unsigned long end, optional <span>SelectionMode</span> selectionMode = "preserve");
   void <span data-x="dom-textarea/input-setSelectionRange">setSelectionRange</span>(unsigned long start, unsigned long end, optional DOMString direction);
@@ -49887,9 +49887,9 @@ interface <dfn>HTMLOptionElement</dfn> : <span>HTMLElement</span> {
   [SameObject] readonly attribute <span>NodeList</span> <span data-x="dom-lfe-labels">labels</span>;
 
   void <span data-x="dom-textarea/input-select">select</span>();
-  attribute unsigned long <span data-x="dom-textarea/input-selectionStart">selectionStart</span>;
-  attribute unsigned long <span data-x="dom-textarea/input-selectionEnd">selectionEnd</span>;
-  attribute DOMString <span data-x="dom-textarea/input-selectionDirection">selectionDirection</span>;
+  attribute unsigned long? <span data-x="dom-textarea/input-selectionStart">selectionStart</span>;
+  attribute unsigned long? <span data-x="dom-textarea/input-selectionEnd">selectionEnd</span>;
+  attribute DOMString? <span data-x="dom-textarea/input-selectionDirection">selectionDirection</span>;
   void <span data-x="dom-textarea/input-setRangeText">setRangeText</span>(DOMString replacement);
   void <span data-x="dom-textarea/input-setRangeText">setRangeText</span>(DOMString replacement, unsigned long start, unsigned long end, optional <span>SelectionMode</span> selectionMode = "preserve");
   void <span data-x="dom-textarea/input-setSelectionRange">setSelectionRange</span>(unsigned long start, unsigned long end, optional DOMString direction);
@@ -54320,9 +54320,9 @@ dictionary <dfn>AutocompleteErrorEventInit</dfn> : <span>EventInit</span> {
   DOM interfaces for handling their selection:</p>
 
   <pre class="idl extract">  void <span data-x="dom-textarea/input-select">select</span>();
-  attribute unsigned long <span data-x="dom-textarea/input-selectionStart">selectionStart</span>;
-  attribute unsigned long <span data-x="dom-textarea/input-selectionEnd">selectionEnd</span>;
-  attribute DOMString <span data-x="dom-textarea/input-selectionDirection">selectionDirection</span>;
+  attribute unsigned long? <span data-x="dom-textarea/input-selectionStart">selectionStart</span>;
+  attribute unsigned long? <span data-x="dom-textarea/input-selectionEnd">selectionEnd</span>;
+  attribute DOMString? <span data-x="dom-textarea/input-selectionDirection">selectionDirection</span>;
   void <span data-x="dom-textarea/input-setRangeText">setRangeText</span>(DOMString replacement);
   void <span data-x="dom-textarea/input-setRangeText">setRangeText</span>(DOMString replacement, unsigned long start, unsigned long end, optional <span>SelectionMode</span> selectionMode = "preserve");
   void <span data-x="dom-textarea/input-setSelectionRange">setSelectionRange</span>(unsigned long start, unsigned long end, optional DOMString direction = "preserve");</pre>
@@ -54433,9 +54433,10 @@ dictionary <dfn>AutocompleteErrorEventInit</dfn> : <span>EventInit</span> {
   <div w-nodev>
 
   <p>For <code>input</code> elements, calling these methods while they <span data-x="do not
-  apply">don't apply</span>, and getting or setting these attributes while they <span data-x="do not
-  apply">don't apply</span>, must throw an <code>InvalidStateError</code> exception. Otherwise, they
-  must act as described below.</p>
+  apply">don't apply</span>, and setting these attributes while they <span data-x="do not
+  apply">don't apply</span>, must throw an <code>InvalidStateError</code> exception; and getting
+  these attributes while they <span data-x="do not apply">don't apply</span> must return null.
+  Otherwise, they must act as described below.</p>
 
   <p>For <code>input</code> elements, these methods and attributes must operate on the element's
   <span data-x="concept-fe-value">value</span>. For <code>textarea</code> elements, these methods and