Editing Template:Hidden begin

<includeonly><div class="mw-collapsible {{#ifeq:{{{showhide|}}}|left|mw-collapsible-leftside-toggle}} {{#if:{{{expanded|}}} | |mw-collapsed}} 
{{{class|}}}" style="box-sizing:border-box;width:100%;font-size:95%;padding:4px;border:{{{border|none}}};{{{style|}}}"><!--
           --><div style="font-size:100%;line-height:1.6;font-weight:bold;background:{{{bg1|transparent}}};text-align:{{{ta1|left}}};{{{extra1|}}};{{{titlestyle|{{{headercss|}}}}}}">{{{header|}}}{{{title|}}}</div><!--
           --><div class="mw-collapsible-content" style="background:{{{bg2|transparent}}};text-align:{{{ta2|left}}};{{{extra2|}}};{{{bodystyle|{{{contentstyle|{{{contentcss|}}}}}}}}}"></includeonly><noinclude>

This template creates a dynamic navigation box using Mediawiki style sheet declarations. In a saved, rendered page this template creates a clickable link that toggles between [show] and [hide]. It displays the first parameter (the heading) with a [show] link on the right. If [show] is clicked by the user, it displays the second parameter (the body) below the heading and the [show] link becomes [hide]. Clicking on [hide] then hides the body and the [hide] link becomes [show] again.

The [[Template:Hidden begin]] and [[Template: Hidden end]] are used to mark a block of text hidden / shown and enabled the toggle. 
__NOTOC__

==Syntax==
<pre style="overflow:auto;">
{{Hidden begin
| expanded = <!--"true", "on", yes", etc, otherwise omit-->
| showhide = <!--"left", otherwise omit-->
| class = 
| style = 
| border =
| title = 
| titlestyle = 
| bg1 = 
| ta1 = 
| contentstyle = 
| bg2 = 
| ta2 = 
<!--Older, semi-deprecated parameters:-->
| header = | extra1 = | extra2 = 
}}
<!----[content to be hidden placed here]---->
{{Hidden end}}
</pre>

===Parameters===
{| class="wikitable"
! Parameter     || Description
|-
| ''showhide'' || Set to "left" (without speechmarks) to switch the [show/hide] link's position from the righthand end of the titlebar (default) to the left.
|-
| ''expanded''  || Set to anything ("true", "yes", etc.) to switch the hidden section's initial state from collapsed (hidden) to expanded (visible).
|-
| ''class''     || [[WP:CLASS#Classes|Class attribute]] affecting entire area.
|-
| ''style''     ||  [[Cascading Style Sheets|CSS styling]] affecting entire area (titlebar and hidden/hideable content).
|-
| ''border''    ||  CSS styling for border around entire area. Will be overridden by any border styles in ''style''.
|-
| ''title''     || Text shown in titlebar.
|-
| style="vertical-align:top;" | ''titlestyle'' || CSS styles to apply to the titlebar (e.g. <pre>|titlestyle=border:1px solid lightgrey;</pre> to produce a border around it; <pre>|titlestyle=background:''color'';</pre> to set its background color to [[Web colors#X11 color names|''color'']]&thinsp;; <pre>|titlestyle=text-align:[center/right];</pre> to switch its text (''title'')'s alignment from left to center or right; etc.).
|-
| ''bg1'' || Background color for titlebar; defaults to transparent. May be overridden if ''titlestyle'' includes anything that changes the background.
|-
| ''ta1'' || Text alignment for titlebar; defaults to left. May be overridden if ''titlestyle'' includes anything that changes the text alignment.
|-
| ''contentstyle''&nbsp; || CSS styling to apply to the hidden/hideable content (e.g. background and text-align, per ''titlestyle'').
|-
| ''bg2'' || Background color for content; defaults to transparent. May be overridden if ''contentstyle'' includes anything changes the background.
|-
| ''ta2'' || Text alignment for content; defaults to left. May be overridden if ''contentstyle'' includes anything that changes the text alignment.
|}

==Examples==

===Example 1===
<pre> {{Hidden begin |title=Default example}}
 * def
 * ghi
 {{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}} |title=Default example}}
* def
* ghi
{{Hidden end}}

===Example 2===
<pre>
 {{Hidden begin
 | titlestyle = background:pink;
 | title = ''titlestyle'' is "background:pink;"
 }}
 * def
 * ghi
 {{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}}
| titlestyle = background:pink;
| title = ''titlestyle'' is "background:pink;"
}}
* def
* ghi
{{Hidden end}}

===Example 3===
<pre>
 {{Hidden begin
 | titlestyle = background:pink;
 | title = added "ta1=center"
 | ta1 = center
 }}
 * def
 * ghi
 {{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}}
| titlestyle = background:pink;
| title = added "ta1=center"
| ta1 = center
}}
* def
* ghi
{{Hidden end}}

===Example 4===
<pre>
 {{Hidden begin
 | titlestyle = background:pink; text-align:right; padding-right:3.0em;
 | title = ''title'' on right with 3.0em padding
 }}
 * change window width and
 * watch title alignment
 {{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}}
| titlestyle = background:pink; text-align:right; padding-right:3.0em;
| title = ''title'' on right with 3.0em padding
}}
* change window width and
* watch title alignment
{{Hidden end}}

===Example 5===
<pre>
 {{Hidden begin |showhide=left |expanded=true
 | titlestyle = background:palegreen;
 | title = ''showhide'' set to "left" and ''expanded'' set to "true"
 }}
 * def
 * ghi
 {{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}} |showhide=left |expanded=true
| titlestyle = background:palegreen;
| title = ''showhide'' set to "left" and ''expanded'' set to "true"
}}
* def
* ghi
{{Hidden end}}

===Example 6===
<pre style="overflow:auto;">
{{Hidden begin |showhide=left
| titlestyle = background:palegreen;
| title = <code style="background:transparent;">showhide=left</code>, hidden content 150% size and in bold (''contentstyle'')
| contentstyle = font-size:150%; font-weight:bold;
}}
* def
* ghi
{{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}} |showhide=left
| titlestyle = background:palegreen;
| title = <code style="background:transparent;">showhide=left</code>, hidden content 150% size and in bold (''contentstyle'')
| contentstyle = font-size:150%; font-weight:bold;
}}
* def
* ghi
{{Hidden end}}

===Example 7===
<!-- This example updated to show that bg1/ta1 only affect titlebar, used ta1=right since it is non-default for titlebar and content. -->
<pre style="overflow:auto;">
{{Hidden begin
| header = [''header'' (deprecated)]
| titlestyle = font-style:italic; padding-right:3.0em;
| title = [''title'' set to this text]
| border = 1px solid grey
| bg1 = palegreen
| ta1 = right
| extra1 = font-size:120%; <!--semicolon required since titlestyle is used-->
| extra2 = font-size:150% <!--semicolon optional when contentstyle not used-->
}}
* make window narrower and
* title will wrap
{{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}}
| header = [''header'' (deprecated)]
| titlestyle = font-style:italic; padding-right:3.0em;
| title = [''title'' set to this text]
| border = 1px solid grey
| bg1 = palegreen
| ta1 = right
| extra1 = font-size:120%;
| extra2 = font-size:150%
}}
* make window narrower and
* title will wrap
{{Hidden end}}

===Example 8===
<pre>
{{Hidden begin
| titlestyle =
| title = title&nbsp;with&nbsp;non-breaking&nbsp;spaces&nbsp;
| border = 1px solid red
| bg1 = cyan
| bg2 = yellow
| ta1 = right
| ta2 = left
| extra1 = font-size:120%; padding-right:2.5em;
| extra2 = font-size:150%; padding-left:3.0em;
}}
* def ... these should have left padding
* ghi
{{Hidden end}}
</pre>
{{Hidden begin{{#ifeq:{{SUBPAGENAME}}|sandbox |/sandbox}}
| titlestyle =
| title = title&nbsp;with&nbsp;non-breaking&nbsp;spaces&nbsp;
| border = 1px solid red
| bg1 = cyan
| bg2 = yellow
| ta1 = right
| ta2 = left
| extra1 = font-size:120%; padding-right:2.5em;
| extra2 = font-size:150%; padding-left:3.0em;
}}
* def ... these should have left padding
* ghi
{{Hidden end}}

</noinclude>