- From: poot <cvsmail@w3.org>
- Date: Tue, 01 Feb 2011 03:19:56 -0500
- To: public-html-diffs@w3.org
hixie: Specify window.atob() and .btoa(). (ack Aryeh for the reverse-
engineering to do this) (whatwg r5814)
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.4672&r2=1.4673&f=h
http://html5.org/tools/web-apps-tracker?from=5813&to=5814
===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.4672
retrieving revision 1.4673
diff -u -d -r1.4672 -r1.4673
--- Overview.html 1 Feb 2011 01:30:12 -0000 1.4672
+++ Overview.html 1 Feb 2011 08:18:35 -0000 1.4673
@@ -240,6 +240,24 @@
.details-example img { vertical-align: top; }
+ #base64-table {
+ white-space: nowrap;
+ font-size: 0.6em;
+ column-width: 6em;
+ column-count: 5;
+ column-gap: 1em;
+ -moz-column-width: 6em;
+ -moz-column-count: 5;
+ -moz-column-gap: 1em;
+ -webkit-column-width: 6em;
+ -webkit-column-count: 5;
+ -webkit-column-gap: 1em;
+ }
+ #base64-table thead { display: none; }
+ #base64-table * { border: none; }
+ #base64-table tbody td:first-child:after { content: ':'; }
+ #base64-table tbody td:last-child { text-align: right; }
+
#named-character-references-table {
white-space: nowrap;
font-size: 0.6em;
@@ -1052,20 +1070,21 @@
<li><a href="#event-firing"><span class="secno">6.1.6.3 </span>Event firing</a></li>
<li><a href="#events-and-the-window-object"><span class="secno">6.1.6.4 </span>Events and the <code>Window</code> object</a></li>
<li><a href="#runtime-script-errors"><span class="secno">6.1.6.5 </span>Runtime script errors</a></ol></ol></li>
- <li><a href="#timers"><span class="secno">6.2 </span>Timers</a></li>
- <li><a href="#user-prompts"><span class="secno">6.3 </span>User prompts</a>
+ <li><a href="#atob"><span class="secno">6.2 </span>Base64 utility methods</a></li>
+ <li><a href="#timers"><span class="secno">6.3 </span>Timers</a></li>
+ <li><a href="#user-prompts"><span class="secno">6.4 </span>User prompts</a>
<ol>
- <li><a href="#simple-dialogs"><span class="secno">6.3.1 </span>Simple dialogs</a></li>
- <li><a href="#printing"><span class="secno">6.3.2 </span>Printing</a></li>
- <li><a href="#dialogs-implemented-using-separate-documents"><span class="secno">6.3.3 </span>Dialogs implemented using separate documents</a></ol></li>
- <li><a href="#system-state-and-capabilities:-the-navigator-object"><span class="secno">6.4 </span>System state and capabilities: the <code>Navigator</code> object</a>
+ <li><a href="#simple-dialogs"><span class="secno">6.4.1 </span>Simple dialogs</a></li>
+ <li><a href="#printing"><span class="secno">6.4.2 </span>Printing</a></li>
+ <li><a href="#dialogs-implemented-using-separate-documents"><span class="secno">6.4.3 </span>Dialogs implemented using separate documents</a></ol></li>
+ <li><a href="#system-state-and-capabilities:-the-navigator-object"><span class="secno">6.5 </span>System state and capabilities: the <code>Navigator</code> object</a>
<ol>
- <li><a href="#client-identification"><span class="secno">6.4.1 </span>Client identification</a></li>
- <li><a href="#custom-handlers"><span class="secno">6.4.2 </span>Custom scheme and content handlers</a>
+ <li><a href="#client-identification"><span class="secno">6.5.1 </span>Client identification</a></li>
+ <li><a href="#custom-handlers"><span class="secno">6.5.2 </span>Custom scheme and content handlers</a>
<ol>
- <li><a href="#security-and-privacy"><span class="secno">6.4.2.1 </span>Security and privacy</a></li>
- <li><a href="#sample-handler-impl"><span class="secno">6.4.2.2 </span>Sample user interface</a></ol></li>
- <li><a href="#manually-releasing-the-storage-mutex"><span class="secno">6.4.3 </span>Manually releasing the storage mutex</a></ol></ol></li>
+ <li><a href="#security-and-privacy"><span class="secno">6.5.2.1 </span>Security and privacy</a></li>
+ <li><a href="#sample-handler-impl"><span class="secno">6.5.2.2 </span>Sample user interface</a></ol></li>
+ <li><a href="#manually-releasing-the-storage-mutex"><span class="secno">6.5.3 </span>Manually releasing the storage mutex</a></ol></ol></li>
<li><a href="#editing"><span class="secno">7 </span>User interaction</a>
<ol>
<li><a href="#the-hidden-attribute"><span class="secno">7.1 </span>The <code>hidden</code> attribute</a></li>
@@ -2878,6 +2897,11 @@
is passed an Infinity or Not-a-Number (NaN) value, a
<code><a href="#not_supported_err">NOT_SUPPORTED_ERR</a></code> exception must be raised.</p>
+ <p>Except where otherwise specified, if a method has an argument
+ of type <code>DOMString</code>, the user agent must <span title="dfn-obtain-unicode">convert the <code>DOMString</code> to a
+ sequence of Unicode characters</span> when the method is invoked,
+ to obtain the string on which the method is to operate. <a href="#refsWEBIDL">[WEBIDL]</a></p>
+
</dd>
<dt>JavaScript</dt>
@@ -48624,7 +48648,228 @@
</dd>
- </dl></div><h3 id="timers"><span class="secno">6.2 </span>Timers</h3><p>The <code title="dom-windowtimers-setTimeout"><a href="#dom-windowtimers-settimeout">setTimeout()</a></code>
+ </dl></div><h3 id="atob"><span class="secno">6.2 </span>Base64 utility methods</h3><p>The <code title="dom-windowbase64-atob"><a href="#dom-windowbase64-atob">atob()</a></code> and <code title="dom-windowbase64-btoa"><a href="#dom-windowbase64-btoa">btoa()</a></code> methods allow authors to
+ transform content to and from the base64 encoding.</p><!-- v2: actual binary support --><pre class="idl">[Supplemental, NoInterfaceObject]
+interface <dfn id="windowbase64">WindowBase64</dfn> {
+ DOMString <a href="#dom-windowbase64-btoa" title="dom-windowbase64-btoa">btoa</a>(in DOMString btoa);
+ DOMString <a href="#dom-windowbase64-atob" title="dom-windowbase64-atob">atob</a>(in DOMString atob);
+};
+<a href="#window">Window</a> implements <a href="#windowbase64">WindowBase64</a>;</pre><p class="note">In these APIs, for mnemonic purposes, the "b" can be
+ considered to stand for "binary", and the "a" for "ASCII". In
+ practice, though, for primarily historical reasons, both the input
+ and output of these functions are Unicode strings.<dl class="domintro"><dt><var title="">result</var> = <var title="">window</var> . <code title="dom-windowbase64-btoa"><a href="#dom-windowbase64-btoa">btoa</a></code>( <var title="">data</var> )</dt>
+
+ <dd>
+
+ <p>Takes the input data, in the form of a Unicode string
+ containing only characters in the range U+0000 to U+00FF, each
+ representing a binary byte with values 0x00 to 0xFF respectively,
+ and converts it to its base64 representation, which it returns.</p>
+
+ <p>Throws an <code><a href="#invalid_character_err">INVALID_CHARACTER_ERR</a></code> exception if the
+ input string contains any out-of-range characters.</p>
+
+ </dd>
+
+ <dt><var title="">result</var> = <var title="">window</var> . <code title="dom-windowbase64-atob"><a href="#dom-windowbase64-atob">atob</a></code>( <var title="">data</var> )</dt>
+
+ <dd>
+
+ <p>Takes the input data, in the form of a Unicode string
+ containing base64-encoded binary data, decodes it, and returns a
+ string consisting of characters in the range U+0000 to U+00FF,
+ each representing a binary byte with values 0x00 to 0xFF
+ respectively, corresponding to that binary data.</p>
+
+ <p>Throws an <code><a href="#invalid_character_err">INVALID_CHARACTER_ERR</a></code> exception if the
+ input string is not valid base64 data.</p>
+
+ </dd>
+
+ </dl><div class="impl">
+
+ <p class="note">The <code><a href="#windowbase64">WindowBase64</a></code> interface adds to the
+ <code><a href="#window">Window</a></code> interface and the <code>WorkerUtils</code>
+ interface (part of Web Workers).</p>
+
+ <p>The <dfn id="dom-windowbase64-btoa" title="dom-windowbase64-btoa"><code>btoa()</code></dfn>
+ method must throw an <code><a href="#invalid_character_err">INVALID_CHARACTER_ERR</a></code> exeption if
+ the method's first argument contains any character whose code point
+ is greater than U+00FF. Otherwise, the user agent must convert that
+ argument to a sequence of octets whose <var title="">n</var>th octet
+ is the eight-bit representation of the code point of the <var title="">n</var>th character of the argument, and then must apply
+ the base64 algorithm to that sequence of octets, and return the
+ result. <a href="#refsRFC4648">[RFC4648]</a><!--base64--></p>
+ <!-- Aryeh says: This seems to be what all browsers do as of January
+ 2011 (except IE, which doesn't support these functions at all). -->
+
+
+ <p>The <dfn id="dom-windowbase64-atob" title="dom-windowbase64-atob"><code>atob()</code></dfn>
+ method must run the following steps to parse the string passed in
+ the method's first argument:</p>
+
+ <ol><!-- Aryeh says: Copies Firefox behavior as of January 2011
+ (4.0b8). WebKit is somewhat laxer, and Opera throws no exceptions
+ at all. gsnedders reports Opera's behavior causes site-compat
+ problems, and I figure most sites depend on Firefox if on anything,
+ so go with that. --><li><p>Let <var title="">input</var> be the string being
+ parsed.</li>
+
+ <li><p>Let <var title="">position</var> be a pointer into <var title="">input</var>, initially pointing at the start of the
+ string.</li>
+
+ <li><p>If the length of <var title="">input</var> divides by 4
+ leaving no remainder, then: if <var title="">input</var> ends with
+ one or two U+003D EQUALS SIGN (=) characters, remove them from <var title="">input</var>.</li>
+
+ <li><p>If the length of <var title="">input</var> divides by 4
+ leaving a remainder of 1, throw an
+ <code><a href="#invalid_character_err">INVALID_CHARACTER_ERR</a></code> exception and abort these
+ steps.</p>
+
+ <li>
+
+ <p>If <var title="">input</var> contains a character that is not
+ in the following list of characters and character ranges, throw an
+ <code><a href="#invalid_character_err">INVALID_CHARACTER_ERR</a></code> exception and abort these
+ steps:</p>
+
+ <ul class="brief"><li>U+002B PLUS SIGN (+)
+ <li>U+002F SOLIDUS (/)
+ <li>U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9)
+ <li>U+0041 LATIN CAPITAL LETTER A to U+005A LATIN CAPITAL LETTER Z
+ <li>U+0061 LATIN SMALL LETTER A to U+007A LATIN SMALL LETTER Z
+ </ul></li>
+
+ <li><p>Let <var title="">output</var> be a string, initially
+ empty.</li>
+
+ <li><p>Let <var title="">buffer</var> be a buffer that can have
+ bits appended to it, initially empty.</li>
+
+ <li>
+
+ <p>While <var title="">position</var> does not point past the end
+ of <var title="">input</var>, run these substeps:</p>
+
+ <ol><li>
+
+ <p>Find the character pointed to by <var title="">position</var>
+ in the first column of the following table. Let <var title="">n</var> be the number given in the second cell of the
+ same row.</p>
+
+ <div id="base64-table">
+ <table><thead><tr><th>Character
+ <th>Number
+ <tbody><tr><td>A<td>0
+ <tr><td>B<td>1
+ <tr><td>C<td>2
+ <tr><td>D<td>3
+ <tr><td>E<td>4
+ <tr><td>F<td>5
+ <tr><td>G<td>6
+ <tr><td>H<td>7
+ <tr><td>I<td>8
+ <tr><td>J<td>9
+ <tr><td>K<td>10
+ <tr><td>L<td>11
+ <tr><td>M<td>12
+ <tr><td>N<td>13
+ <tr><td>O<td>14
+ <tr><td>P<td>15
+ <tr><td>Q<td>16
+ <tr><td>R<td>17
+ <tr><td>S<td>18
+ <tr><td>T<td>19
+ <tr><td>U<td>20
+ <tr><td>V<td>21
+ <tr><td>W<td>22
+ <tr><td>X<td>23
+ <tr><td>Y<td>24
+ <tr><td>Z<td>25
+ <tr><td>a<td>26
+ <tr><td>b<td>27
+ <tr><td>c<td>28
+ <tr><td>d<td>29
+ <tr><td>e<td>30
+ <tr><td>f<td>31
+ <tr><td>g<td>32
+ <tr><td>h<td>33
+ <tr><td>i<td>34
+ <tr><td>j<td>35
+ <tr><td>k<td>36
+ <tr><td>l<td>37
+ <tr><td>m<td>38
+ <tr><td>n<td>39
+ <tr><td>o<td>40
+ <tr><td>p<td>41
+ <tr><td>q<td>42
+ <tr><td>r<td>43
+ <tr><td>s<td>44
+ <tr><td>t<td>45
+ <tr><td>u<td>46
+ <tr><td>v<td>47
+ <tr><td>w<td>48
+ <tr><td>x<td>49
+ <tr><td>y<td>50
+ <tr><td>z<td>51
+ <tr><td>0<td>52
+ <tr><td>1<td>53
+ <tr><td>2<td>54
+ <tr><td>3<td>55
+ <tr><td>4<td>56
+ <tr><td>5<td>57
+ <tr><td>6<td>58
+ <tr><td>7<td>59
+ <tr><td>8<td>60
+ <tr><td>9<td>61
+ <tr><td>+<td>62
+ <tr><td>/<td>63
+ </table></div>
+
+ </li>
+
+ <li><p>Append to <var title="">buffer</var> the six bits
+ corresponding to <var title="">number</var>, most significant bit
+ first.</li>
+
+ <li><p>If <var title="">buffer</var> has accumulated 24 bits,
+ interpret them as three 8-bit big-endian numbers. Append the
+ three characters with code points equal to those numbers to <var title="">output</var>, in the same order, and then empty <var title="">buffer</var>.</li>
+
+ <li><p>Advance <var title="">position</var> by one
+ character.</li>
+
+ </ol></li>
+
+ <li>
+
+ <p>If <var title="">buffer</var> is not empty, it contains either
+ 12 or 18 bits. If it contains 12 bits, discard the last four and
+ interpret the remaining eight as an 8-bit big-endian number. If it
+ contains 18 bits, discard the last two and interpret the remaining
+ 16 as two 8-bit big-endian numbers. Append the one or two
+ characters with code points equal to those one or two numbers to
+ <var title="">output</var>, in the same order.</p>
+
+ <p>The discarded bits mean that, for instance, <code title="">atob("YQ")</code> and <code title="">atob("YR")</code>
+ both return "<code title="">a</code>".</p>
+
+ </li>
+
+ <li><p>Return <var title="">output</var>.</li>
+
+ </ol><!-- Note: this function is defined explicitly here because RFC4648
+ does not specify how to handle erroneous input, and no preexisting
+ browser implementation simply throws an exception on all erroneous
+ input. --><p class="note">Some base64 encoders add newlines or other
+ whitespace to their output. The <code title="dom-windowbase64-atob"><a href="#dom-windowbase64-atob">atob()</a></code> method throws an
+ exception if its input contains characters other than those
+ described by the regular expression bracket expression <code title="">[+/=0-9A-Za-z]</code>, so other characters need to be
+ removed before <code title="dom-windowbase64-atob"><a href="#dom-windowbase64-atob">atob()</a></code> is
+ used for decoding.</p>
+
+ </div><h3 id="timers"><span class="secno">6.3 </span>Timers</h3><p>The <code title="dom-windowtimers-setTimeout"><a href="#dom-windowtimers-settimeout">setTimeout()</a></code>
and <code title="dom-windowtimers-setInterval"><a href="#dom-windowtimers-setinterval">setInterval()</a></code>
methods allow authors to schedule timer-based callbacks.<pre class="idl">[Supplemental, NoInterfaceObject]
interface <dfn id="windowtimers">WindowTimers</dfn> {
@@ -48932,14 +49177,14 @@
</ol><hr><p>The <a href="#task-source">task source</a> for these <a href="#concept-task" title="concept-task">tasks</a> is the <dfn id="timer-task-source">timer task
source</dfn>.</p>
- </div><h3 id="user-prompts"><span class="secno">6.3 </span>User prompts</h3><!--
+ </div><h3 id="user-prompts"><span class="secno">6.4 </span>User prompts</h3><!--
v2 ideas:
* in-window modal dialogs
- escape/enter handling
- dragging the window out of the tab
* in-window non-modal palettes
- with a solution for the mobile space
- --><h4 id="simple-dialogs"><span class="secno">6.3.1 </span>Simple dialogs</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-alert"><a href="#dom-alert">alert</a></code>(<var title="">message</var>)</dt>
+ --><h4 id="simple-dialogs"><span class="secno">6.4.1 </span>Simple dialogs</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-alert"><a href="#dom-alert">alert</a></code>(<var title="">message</var>)</dt>
<dd>
<p>Displays a modal alert with the given message, and waits for the user to dismiss it.</p>
@@ -49001,7 +49246,7 @@
user aborts, then the method must return null; otherwise, the method
must return the string that the user responded with.</p>
- </div><h4 id="printing"><span class="secno">6.3.2 </span>Printing</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-print"><a href="#dom-print">print</a></code>()</dt>
+ </div><h4 id="printing"><span class="secno">6.4.2 </span>Printing</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-print"><a href="#dom-print">print</a></code>()</dt>
<dd>
@@ -49090,7 +49335,7 @@
</li>
- </ol></div><h4 id="dialogs-implemented-using-separate-documents"><span class="secno">6.3.3 </span>Dialogs implemented using separate documents</h4><dl class="domintro"><dt><var title="">result</var> = <var title="">window</var> . <code title="dom-showModalDialog"><a href="#dom-showmodaldialog">showModalDialog</a></code>(<var title="">url</var> [, <var title="">argument</var>] )</dt>
+ </ol></div><h4 id="dialogs-implemented-using-separate-documents"><span class="secno">6.4.3 </span>Dialogs implemented using separate documents</h4><dl class="domintro"><dt><var title="">result</var> = <var title="">window</var> . <code title="dom-showModalDialog"><a href="#dom-showmodaldialog">showModalDialog</a></code>(<var title="">url</var> [, <var title="">argument</var>] )</dt>
<dd>
@@ -49296,7 +49541,7 @@
value</a> to the given new value.</p>
</div><p class="note">The <code title="dom-window-close"><a href="#dom-window-close">window.close()</a></code> method can be used to
- close the browsing context.<h3 id="system-state-and-capabilities:-the-navigator-object"><span class="secno">6.4 </span>System state and capabilities: the <code><a href="#navigator">Navigator</a></code> object</h3><div class="impl">
+ close the browsing context.<h3 id="system-state-and-capabilities:-the-navigator-object"><span class="secno">6.5 </span>System state and capabilities: the <code><a href="#navigator">Navigator</a></code> object</h3><div class="impl">
<p>The <dfn id="dom-navigator" title="dom-navigator"><code>navigator</code></dfn>
attribute of the <code><a href="#window">Window</a></code> interface must return an
@@ -49352,7 +49597,7 @@
<dd><p>Must return either null or a language tag representing the user's preferred language.</p></dd>
-->
- </div><h4 id="client-identification"><span class="secno">6.4.1 </span>Client identification</h4><p>In certain cases, despite the best efforts of the entire
+ </div><h4 id="client-identification"><span class="secno">6.5.1 </span>Client identification</h4><p>In certain cases, despite the best efforts of the entire
industry, Web browsers have bugs and limitations that Web authors
are forced to work around.<p>This section defines a collection of attributes that can be used
to determine, from script, the kind of user agent in use, in order
@@ -49417,7 +49662,7 @@
identified. For this reason, user agent implementors are strongly
urged to include as little information in this API as possible.</p>
- </div><h4 id="custom-handlers"><span class="secno">6.4.2 </span>Custom scheme and content handlers</h4><p>The <dfn id="dom-navigator-registerprotocolhandler" title="dom-navigator-registerProtocolHandler"><code>registerProtocolHandler()</code></dfn>
+ </div><h4 id="custom-handlers"><span class="secno">6.5.2 </span>Custom scheme and content handlers</h4><p>The <dfn id="dom-navigator-registerprotocolhandler" title="dom-navigator-registerProtocolHandler"><code>registerProtocolHandler()</code></dfn>
method allows Web sites to register themselves as possible handlers
for particular schemes. For example, an online telephone messaging
service could register itself as a handler of the <code>sms:</code>
@@ -49605,7 +49850,7 @@
</div><div class="impl">
- <h5 id="security-and-privacy"><span class="secno">6.4.2.1 </span>Security and privacy</h5>
+ <h5 id="security-and-privacy"><span class="secno">6.5.2.1 </span>Security and privacy</h5>
<p>These mechanisms can introduce a number of concerns, in
particular privacy concerns.</p>
@@ -49686,7 +49931,7 @@
</div><div class="impl">
- <h5 id="sample-handler-impl"><span class="secno">6.4.2.2 </span>Sample user interface</h5>
+ <h5 id="sample-handler-impl"><span class="secno">6.5.2.2 </span>Sample user interface</h5>
<p><i>This section is non-normative.</i></p>
@@ -49728,7 +49973,7 @@
method would work equivalently, but for schemes instead of unknown
content types.</p>
- </div><h4 id="manually-releasing-the-storage-mutex"><span class="secno">6.4.3 </span>Manually releasing the storage mutex</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-navigator"><a href="#dom-navigator">navigator</a></code> . <code title="dom-navigator-yieldForStorageUpdates"><a href="#dom-navigator-yieldforstorageupdates">yieldForStorageUpdates</a></code>()</dt>
+ </div><h4 id="manually-releasing-the-storage-mutex"><span class="secno">6.5.3 </span>Manually releasing the storage mutex</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-navigator"><a href="#dom-navigator">navigator</a></code> . <code title="dom-navigator-yieldForStorageUpdates"><a href="#dom-navigator-yieldforstorageupdates">yieldForStorageUpdates</a></code>()</dt>
<dd>
Received on Tuesday, 1 February 2011 08:19:59 UTC