Commit 54acb9e

|manifest|["id"] is [=url/equal=] with [=URL serializer/exclude

fragment|exclude fragment true=] to the [=identity=] of an

already-installed application, it SHOULD be used as a signal that this

manifest is a replacement for the already-installed application's

manifest, and not a distinct application, even if it is served from a

different URL than the one seen previously.

<li>

If the [=document=]'s [=document|processed

manifest=] is not null, and [=document=]'s [=document|processed

manifest=]'s id is not

[=URL/equal=] with [=URL serializer/exclude fragment|exclude fragment true=] to |manifest|["id"],

return.

</li>

<p>

As specified for [^link/rel/manifest^] link relation, the manifest

is fetched and processed on every page load. When the [=processing

a manifest=] is successful, user agents MAY apply updated manifest

to any current and future <a>application contexts</a> associated

with the application.

</p>

<p>

For the purpose of updating, the following member are

<dfn>security-sensitive members</dfn>, as they are presented during

installation and on launch surfaces:

</p>

<ol>

<li>[=manifest/short_name=],

</li>

<li>[=manifest/icons=]

</li>

<li>[=manifest/name=],

</li>

</ol>

<p data-cite="permissions">

User agents SHOULD NOT automatically apply changes to

[=security-sensitive members=] without [=express permission=] from

the user.

</p>

<p>

Instead, user agents SHOULD present changes to [=security-sensitive

members=] with appropriate management options, so the user can make

an informed decision about updating the web application.

</p>

<p>

The user agent MAY automatically apply the changes if the update

does not contain changes to [=security-sensitive members=].

</p>

<aside class="note" title=

"A user agent will not apply a partial update">

<p>

When the update contains changes both to [=security-sensitive

members=] and other members, a user agent won't automatically

partially update. For example, the user agent could present

options to the user:

</p>

<ol>

<li>Accept the update

</li>

<li>Uninstall the web app

</li>

</ol>

</aside>