No subject

Tue Jan 27 15:54:36 PST 2015

-- 
You are receiving this mail because:
You are the assignee for the bug.
--1424712348.f5cc3df70.25402
Date: Mon, 23 Feb 2015 09:25:48 -0800
MIME-Version: 1.0
Content-Type: text/html

<html>
    <head>
      <base href="https://bugs.webkit.org/" />
    </head>
    <body><span class="vcard"><a class="email" href="mailto:benjamin&#64;webkit.org" title="Benjamin Poulain &lt;benjamin&#64;webkit.org&gt;"> <span class="fn">Benjamin Poulain</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED WONTFIX - Viewport height is taller than the visible part of the document in some mobile browsers"
   href="https://bugs.webkit.org/show_bug.cgi?id=141832">bug 141832</a>
        <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>WONTFIX
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED WONTFIX - Viewport height is taller than the visible part of the document in some mobile browsers"
   href="https://bugs.webkit.org/show_bug.cgi?id=141832#c5">Comment # 5</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED WONTFIX - Viewport height is taller than the visible part of the document in some mobile browsers"
   href="https://bugs.webkit.org/show_bug.cgi?id=141832">bug 141832</a>
              from <span class="vcard"><a class="email" href="mailto:benjamin&#64;webkit.org" title="Benjamin Poulain &lt;benjamin&#64;webkit.org&gt;"> <span class="fn">Benjamin Poulain</span></a>
</span></b>
        <pre>This is completely intentional. It took quite a bit of work on our part to achieve this effect. :)

The base problem is this: the visible area changes dynamically as you scroll. If we update the CSS viewport height accordingly, we need to update the layout during the scroll. Not only that looks like shit, but doing that at 60 FPS is practically impossible in most pages (60 FPS is the baseline framerate on iOS).

It is hard to show you the &quot;looks like shit&quot; part, but imagine as you scroll, the contents moves and what you want on screen is continuously shifting.

Dynamically updating the height was not working, we had a few choices: drop viewport units on iOS, match the document size like before iOS 8, use the small view size, use the large view size.