Bug 17714 – anchor elements href="#" and "name" attribute cause the page to jump to the end

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[jasneet]

I Steps:
Go to
the attached reduction.
Click on "Click me"

II Issue:
Notice that on clicking "Click me", the page jumps to the end. This happens only in Safari

III Conclusion: combination of href="#" and name="" is causing the issue. 

IV Other browsers:
IE7: ok
FF: ok
Opera: ok

V Nightly tested: 30236

[jasneet]

Created attachment 19597 [details]
reduction

[Robert Blaut]

Confirmed.

[Yuzhu Shen]

This issue is similar with bug 14867. Because of revision 30243, however, bug 14867 is ok now.

In revision 30243, FrameLoader::gotoAnchor() is modified:
DeprecatedString ref = m_URL.encodedHtmlRef(); --> String ref = m_URL.ref();

With this change, WebKit now interprets the fragment identifier of <a href="#"> as an empty string (length = 0) instead of a null string. 

As I commented in bug 14867, WebKit searches the anchor node in two steps: (in bool FrameLoader::gotoAnchor(const String& name))
1) searches any node whose id attribute is the same as the fragment identifier.
   If the fragment identifier is an empty string, it returns directly.

2) searches in a set of <a> elements that have name attributes, using HTMLCollection::namedItem().
   It should be noted that namedItem() first searches for an object with a matching id attribute. If a match is not found, the method then searches for an
 object with a matching name attribute.

   Consider the following node:
   <a name="">...</a>

   Its id attribute is not specified (returned as a null string when querying it), so it won't match. However, if we are searching with a empty string, it will match the name attribute.

As a result, clicking the "Goto Top" link in the page below will bring you to the anchor "Oops!" but not the top of the page.

=======================================
...
<a href="#">Goto Top</a>
...
...
<a name="">Oops!</a>
...
=======================================

[Yuzhu Shen]

Created attachment 19660 [details]
The patch for this bug.

[Darin Adler]

Comment on attachment 19660 [details]
The patch for this bug.

r=me

[Darin Adler]

Committed revision 31083.