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<entry-title>Web sign-in</entry-title>

Use the (Web sign-in) button on a site to sign-in with your personal web address.

When you click a (Web sign-in) button, the site will ask you for your web address, e.g.:

<blockquote style="border:1px solid gray; float:left; clear; left; padding:1em">
Web address: [........................] (Sign-in) 
</blockquote>
<div style="clear:both">or:</div>

<blockquote style="border:1px solid gray; float:left; clear; left; padding:1em">
Web address: <br/>
[........................] <br/>
(Sign-in) 
</blockquote>
<div style="clear:both">&nbsp;</div>

Enter your personal web address and press return / click (Sign-in).

== set up ==

Your personal site must be set up for web sign-in. 

# Link from your personal site to your other profiles. Add <code>rel="me"</code> to those hyperlinks. E.g.: <blockquote style="white-space:nowrap"><code>&lt;a <strong>rel="me"</strong> <nowiki>href="http://twitter.com/your_twitter_alias"&gt;...</nowiki></code></blockquote>
# Edit your other profiles, e.g. your [https://twitter.com/settings/profile Twitter profile settings], and set the "Web" ("homepage", "Website/Blog") field to your personal site. E.g. <blockquote style="white-space:nowrap">Web <span style="border:1px solid silver; padding:5px; margin-left:1em"><nowiki>http://yoursite.example.com/</nowiki></span></blockquote>
# When you use your personal site with web sign-in the first time[[#subsequent|*]], your browser will redirect you to to your online profile, e.g. Twitter, and ask you to:
#* Sign-in with your account on that profile (e.g. sign in to Twitter) if you're not already signed-in.
#* Authorize the site to use your account, e.g. your Twitter account: <blockquote><p>Authorize Site to use your account?</p><p>This application will be able to:</p><ul><li>Read Tweets from your timeline.</li><li>See who you follow.</li></ul><p>( Sign In )</p></blockquote> Click the <b>( Sign In )</b> button and you should be all set.

<nowiki>*</nowiki> <span id="subsequent">Subsequent</span> sign-ins to the same web sign-in form should be pre-filled with your domain name (e.g. via a cookie from the site) so all you have to do is click (Sign-in). In addition, if the site is properly using HTML5 <code>&lt;input type=url&gt;</code>, browsers will help you auto-complete your personal web address for you across all sites that do web sign-in.

== developers ==
=== user interface ===
For the Web sign-in UI, see the text mockups at the top of this page as a design starting point.

Important details:
* The web address input "[........................]" MUST accept 
** a "plain domain" e.g. tantek.com and canonicalize that to http://tantek.com/
** an http(s) domain without a path e.g. http://sixtwothree.org or https://sixtwothree.org and canonicalize http://sixtwothree.org/ or https://sixtwothree.org/ respectively

=== protocol ===
See the [[RelMeAuth]] page for documentation on how to support Web sign-in protocol on your site.

=== example implementations ===
* [http://tantek.com/relmeauth/ RelMeAuth prototype] demonstrates Web sign-in for both read-only/read-write permissions, and provides a simple interface for Tweeting when read-write permissions are provided.
* [http://indieauth.com IndieAuth] not only uses Web sign-in but also provides a web sign-in authentication API!
** IndieWebCamp: Try out IndieAuth by signing-in to [http://IndieWebCamp.com IndieWebCamp.com].

== why ==
See [http://indiewebcamp.com/Why_web_sign-in Why web sign-in] on the IndieWebCamp site.
Return to web-sign-in.
Retrieved from "http://mt.microformats.org/wiki/web-sign-in"
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