<li>If none of |data|'s members {{ShareData/title}},

{{ShareData/text}}, or {{ShareData/url}} or {{ShareData/files}} are

present, return <a>a promise rejected with</a> a {{TypeError}}.

<li>If |data|'s {{ShareData/files}} member is present:

<ol>

<li>If |data|'s {{ShareData/files}} member is empty, or if the

implementation does not support file sharing, return <a>a

promise rejected with</a> a {{TypeError}}, and abort these

steps.

</li>

</ol>

<li>Let |base:URL| be the [=this=] value's <a>relevant settings

object</a>'s [=environment settings object/api base URL=].

</li>

<li>If |url| is failure, return <a>a promise rejected with</a>

{{TypeError}}.

</li>

<li>If |url|'s [=URL/scheme=] is not "http" or "https", return

<a>a promise rejected with</a> {{TypeError}}.