Overview.bs

<pre class='metadata'>
Title: CSS Text Decoration Module Level 4
Shortname: css-text-decor
Level: 4
Status: ED
Date: 2018-03-13
Work Status: Exploring
Group: csswg
ED: https://drafts.csswg.org/css-text-decor-4/
TR: https://www.w3.org/TR/css-text-decor-4/
Issue Tracking: Tracker http://www.w3.org/Style/CSS/Tracker/products/10
Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
Editor: Koji Ishii, Google, kojiishi@gmail.com, w3cid 45369
Abstract: This module contains the features of CSS relating to text decoration, such as underlines, text shadows, and emphasis marks.
Link Defaults: css-color-3 (property) color, css-break-3 (dfn) fragment
</pre>

<pre class="link-defaults">
spec:css-text-3; type:dfn; text:character
spec:fill-stroke-3; type:property;
    text: fill
    text: stroke
</pre>
		
<h2 id=intro>Introduction</h2>

	This is the initial draft of CSS Text Decoration Level 4;
	it is being maintained as a diff spec against <a href="https://www.w3.org/TR/css-text-decor-3/">CSS Text Decoration Level 3</a>.


<h2 id="line-decoration">
Additional Controls for Line Decorations</h2>

<h3 id="text-decoration-line-property">
Text Decoration Lines: the 'text-decoration-line' property</h3>

	<pre class="propdef">
	Name: text-decoration-line
	Value: none | [ underline || overline || line-through || blink ] | spelling-error | grammar-error
	Initial: none
	Inherited: no (but see prose, above)
	Computed value: specified keyword(s)
	Animation type: discrete
	</pre>

	Specifies what line decorations, if any, are added to the element.
	Values have the following meanings:</p>

	<dl>
		<dt><dfn value for="text-decoration-line">none</dfn>
		<dd>
			Neither produces nor inhibits text decoration.

		<dt><dfn value for="text-decoration-line">underline</dfn>
		<dd>
			Each line of text is underlined.

		<dt><dfn value for="text-decoration-line">overline</dfn>
		<dd>
			Each line of text has a line over it
			(i.e. on the opposite side from an underline).

		<dt><dfn value for="text-decoration-line">line-through</dfn>
		<dd>
			Each line of text has a line through the middle.

		<dt><dfn value for="text-decoration-line">blink</dfn>
		<dd>
			The text blinks (alternates between visible and invisible).
			Conforming user agents may simply not blink the text.
			Note that not blinking the text is one technique to satisfy
			<a href="https://www.w3.org/TR/UAAG/guidelines.html#tech-on-off-blinking-text">checkpoint 3.3 of WAI-UAAG</a>.
			This value is <strong>deprecated</strong>
			in favor of Animations [[CSS3-ANIMATIONS]].

		<dt><dfn value for="text-tecoration-line">spelling-error</dfn>
		<dd>
			This value indicates the type of text decoration
			used by the User Agent to highlight spelling mistakes.
			Its appearance is UA-defined,
			and may be platform-dependent.
			<span class=note>It is often rendered as a red wavy underline.</span>

		<dt><dfn value for="text-decoration-line">grammar-error</dfn>
		<dd>
			This value indicates the type of text decoration
			used by the User Agent to highlight grammar mistakes.
			Its appearance is UA defined,
			and may be platform-dependent.
			<span class=note>It is often rendered as a green wavy underline.</span>
	</dl>

	Note: In <a>vertical writing modes</a>,
	'text-underline-position' can cause the underline and overline to switch sides.
	This allows the position of underlines to key off of language-specific preferences
	automatically.

	Since ''spelling-error'' and ''grammar-error'' decorations are entirely UA-defined,
	the UA <em>may</em> disregard
	the other <a>sub-properties</a> of 'text-decoration',
	as well any other properties typically affecting the appearance of line decorations
	(such as 'text-underline-position', 'color', 'stroke', or 'fill')
	when rendering these decorations.
	However,
	to the extent that honoring any of these properties
	would be meaningful and practical
	given the UA's chosen rendering,
	the UA <em>should</em> apply them
	as modifications to its default styling.

<h3 id="text-decoration-width-property">
Text Decoration Line Thickness: the 'text-decoration-width' property</h3>

	<pre class="propdef">
	Name: text-decoration-width
	Value: auto | from-font | <<length>>
	Initial: auto
	Applies to: all elements
	Inherited: no
	Percentages: N/A
	Computed value: specified keyword or absolute length
	Animation type: by computed value
	</pre>

	This property, which is also a <a>sub-property</a> of the 'text-decoration' shorthand,
	sets the stroke thickness of underlines, overlines, and line-throughs.

	Values have the following meanings:

	<dl dfn-for=text-decoration-width dfn-type=value>
		<dt><dfn>auto</dfn>
		<dd>
			The UA chooses an appropriate thickness for text decoration lines;
			see below.

		<dt><dfn>from-font</dfn>
		<dd>
			If the <a>first available font</a> has
			metrics indicating a preferred underline width,
			use that width,
			otherwise behaves as ''text-decoration-width/auto''.

		<dt><dfn><<length>></dfn>
		<dd>
			Specifies the thickness of text decoration lines as a length.
			The UA must floor the actual value at one device pixel.
			Authors are strongly encouraged to use ''em'' units
			so that the line thickness scales with the font.
	</dl>

<h4 id="text-decoration-thickness">
Automatic Thickness of Text Decoration Lines</h4>

	Issue: Insert L3 text here.

<h3 id="line-position">
Determining the Position and Thickness of Line Decorations</h3>

	Issue: This section is copied over from early drafts of Text Decoration Level 3.
	It is still under review, and needs integration with 'text-underline-offset' and 'text-decoration-width'.

	<p>Since line decorations can span elements with varying font sizes and
		vertical alignments, the best position for a line decoration is not
		necessarily the ideal position dictated by the <a>decorating box</a>.
		Instead, it's calculated, per line, from all text decorated by the <a>decorating box</a> on that line,
		the <dfn>considered text</dfn>.
		However, descendants of the <a>decorating box</a>
		that are skipped due to 'text-decoration-skip',
		descendant inlines with ''text-decoration-skip: ink'',
		and any descendants that do not participate in the <a>decorating box</a>’s inline formatting context
		are excluded from the set of <a>considered text</a>.

	<p>
		The line decoration positions are then calculated
		per line
		as follows
		(treating <a>over</a>-positioned underlines</a> as <a>over</a> lines
		and <a>under</a>-positioned overlines</a> as <a>under</a> lines):

	<dl>
		<dt><a>over</a> lines
		<dd>
			Align the line decoration with respect to the highest
			<a>over</a> EM-box edge
			of the <a>considered text</a>.

		<dt><a>alphabetic</a> underlines
		<dd>
			<p>The alphabetic underline position is calculated by taking
			the ideal offset (from the alphabetic baseline) of each run of <a>considered text</a>,
			averaging those, and then using the lowest alphabetic baseline to actually position the line.
			(Alphabetic baselines can differ between ''vertical-align/baseline''-aligned boxes
			 if the dominant baseline is non-alphabetic.)
			To prevent superscripts and subscripts from throwing this position off-kilter,
			an inline with a non-initial computed 'vertical-align'
			is treated as having the ideal underline position of its parent.

		<dt>non-alphabetic <a>under</a> lines
		<dd>
			Position the line decoration with respect to the lowest
			<a>under</a> EM-box edge
			of the <a>considered text</a>.

		<dt>line-throughs
		<dd>
			Line-throughs essentially use the same sort of averaging as for alphabetic underlines,
			but recompute the position when drawing across a descendant with a different computed 'font-size'.
			(This ensures that the text remains effectively “crossed out” despite any font size changes.)
			For each run of <a>considered text</a> with the same 'font-size',
			compute an ideal position averaged from its font metrics.
			To prevent superscripts and subscripts from throwing this position off-kilter,
			an inline with a non-initial computed 'vertical-align'
			is treated as having the ideal underline position of its parent.
			Position the portion of the line across each decorated fragment at that position.

			<p class='issue'>
				For simplicity, line-throughs should draw over each element at that element's preferred/averaged position.
				This can produce some undesirable jumpiness,
				but there doesn't appear to be any way to avoid that which is correct in all instances,
				and all attempts are worryingly complex.
				What position should line-throughts adopt over elements that have a different font-size,
				but no <a>considered text</a>?
	</dl>

	<p>
		CSS does not define the thickness of line decorations.
		In determining the thickness of text decoration lines,
		user agents may consider the font sizes, faces, and weights of descendants
		to provide an appropriately averaged thickness.

	<div class="example">
		<p>The following figure shows the averaging for underline:
		<p><img alt="In the first rendering of the underlined text '1st a'
								 with 'st' as a superscript, both the '1st' and the 'a'
								 are rendered in a small font. In the second rendering,
								 the 'a' is rendered in a larger font. In the third, both
								 '1st' and 'a' are large."
						height="105" src="images/underline-averaging.gif" width="326">
		<p>In the three fragments of underlined text, the underline is drawn
			consecutively lower and thicker as the ratio of large text to small
			text increases.</p>
		<p>Using the same example, a line-through would in the second fragment,
		instead of averaging the two font sizes,
		split the line-through into two segments:
		<p><img alt="" src="images/linethrough-averaging.gif">
		<p>In both cases, however, the superscript, due to the vertical-alignment shift,
		has no effect on the position of the line.
	</div>

<h3 id="underline-offset">
Text Underline Offset: the 'text-underline-offset' property</h3>

	<pre class="propdef">
	Name: text-underline-offset
	Value: auto | from-font | <<length>>
	Initial: auto
	Applies to: all elements
	Inherited: yes
	Percentages: N/A
	Computed value: specified keyword or absolute length
	Animation type: by computed value
	</pre>

	This property, which is <em>not</em> a <a>sub-property</a> of the 'text-decoration' shorthand,
	sets the offset of underlines from their initial position.

	Values have the following meanings:

	<dl dfn-for=text-underline-offset dfn-type=value>
		<dt><dfn>auto</dfn>
		<dd>
			The UA chooses an appropriate offset for underlines.

		<dt><dfn>from-font</dfn>
		<dd>
			If the <a>first available font</a> has
			metrics indicating a preferred underline offset,
			use that offset,
			otherwise behaves as ''text-underline-offset/auto''.

		<dt><dfn><<length>>
		<dd>
			Specifies the offset of underlines as a length.
			This replaces any information in the font
			or derived from glyph shapes / character ranges.
			Authors are strongly encouraged to use ''em'' units
			so that the offset scales with the font.
	</dl>

	The initial position of the underline depends on the value of 'text-underline-position'
	as detailed below.

	<table class="data">
		<caption>Interaction of 'text-underline-position' and 'text-underline-offset'
		<thead>
			<tr>
				<th>'text-underline-position'
				<th>Initial Position
				<th>Positive Direction
		<tbody>
			<tr>
				<td>''text-underline-position/auto''
				<td>alphabetic baseline
				<td><a>over</a>
			<tr>
				<td>''text-underline-position/under''
				<td>text-under edge
				<td><a>over</a>
			<tr>
				<td>''text-underline-position/over''
				<td>text-over edge
				<td><a>under</a>
	</table>

	<ul>
		<li>The line is aligned to the outside of the specified position.
		    (Below for ''text-underline-position/under''/''text-underline-position/auto'' positions,
		    above for ''text-underline-position/over''.)
		<li>Positive lengths represent inward distances; negative lengths outward.
		<li>Automatic adjustments made to accommodate descendant content are maintained;
			the 'text-underline-offset' is in addition to those.
			<span class="issue">Should this be removed?</span>
	</ul>

	When the value of the 'text-decoration-line' property is either
	''spelling-error'' or ''grammar-error'',
	the UA may ignore the value of 'text-underline-position'.

<h3 id="text-decoration-skipping">
Text Decoration Line Continuity</h3>

<h4 id="text-decoration-skip-property">
Text Decoration Line Continuity: the 'text-decoration-skip' property</h4>

	<pre class="propdef">
	Name: text-decoration-skip
	Value: none | [ objects || [ spaces | [ leading-spaces || trailing-spaces ] ] || edges || box-decoration ]
	Initial: objects leading-spaces trailing-spaces
	Applies to: all elements
	Inherited: yes
	Percentages: N/A
	Computed value: specified keyword(s)
	Animation type: discrete
	</pre>

	Issue: The initial value is quite verbose,
	which makes it inconvenient to set the property
	to the initial value plus something else.
	We should make this easier to specify.

	Issue: This property will be split into individual properties
	along the lines of 'text-decoration-skip-ink',
	to improve its cascading behavior.
	See <a href="https://github.com/w3c/csswg-drafts/issues/843">discussion</a>
	and <a href="https://lists.w3.org/Archives/Public/www-style/2017Feb/0049.html">resolution</a>.

	This property specifies what parts of the element's content
	any text decoration affecting the element must skip over. It
	controls all text decoration lines drawn by the element
	and also any text decoration lines drawn by its ancestors.
	Values have the following meanings:</p>

	<dl>
		<dt><dfn value for="text-decoration-skip">none</dfn></dt>
		<dd>
			Skip nothing: text-decoration is drawn for all text content
			and across atomic inline-level boxes.</dd>

		<dt><dfn value for="text-decoration-skip">objects</dfn></dt>
		<dd>
			Skip this element (its entire margin box) if it is an atomic inline
			(such as an image or inline-block).

		<dt><dfn value for="text-decoration-skip">spaces</dfn></dt>
		<dd>
			Skip all spacing, i.e. all <a>typographic character units</a> with the Unicode White_Space property [[UAX44]],
			plus any adjacent 'letter-spacing' or 'word-spacing'.

		<dt><dfn value for="text-decoration-skip">edges</dfn></dt>
		<dd>
			The UA should place the start and end of the line inwards slightly
			(e.g. by half a line thickness)
			from the content edge of the <a>decorating box</a> so that,
			e.g. two underlined elements side-by-side do not appear to have a single underline.
			(This is important in Chinese, where underlining is a form of punctuation.)

			<div class="figure">
				<p><img title="text-decoration-skip: edges"
						alt="An underline below a series of Chinese characters has a gap between two adjacent underlining elements."
						src="images/decoration-skip-edges.png"
						>
				<p class="caption">''text-decoration-skip: edges'' for <code>&lt;u>石井&lt;/u>&lt;u>艾俐俐&lt;/u></code>
</p>
			</div>

		<dt><dfn value for="text-decoration-skip">box-decoration</dfn>
		<dd>
			Skip over the box's margin, border, and padding areas.
			Note that this only has an effect on decorations imposed by an ancestor;
			a <a>decorating box</a> never draws over its own box decoration.

		<dt><dfn>leading-spaces</dfn></dt>
		<dd>
			Skip all spacing,
			i.e. all <a>typographic character units</a> with the Unicode White_Space property [[UAX44]]
			and all <a href="https://www.w3.org/TR/css3-text/#word-separator">word separators</a>
			plus any adjacent 'letter-spacing' or 'word-spacing',
			when located at the start of the line.

		<dt><dfn>trailing-spaces</dfn></dt>
		<dd>
			Skip all spacing,
			i.e. all <a>typographic character units</a> with the Unicode White_Space property [[UAX44]]
			and all <a href="https://www.w3.org/TR/css3-text/#word-separator">word separators</a>
			plus any adjacent 'letter-spacing' or 'word-spacing',
			when located at the end of the line.
	</dl>

	<p class="note">Note that this property inherits and that descendant
		elements can have a different setting.</p>

    The following addition is made to the default UA stylesheet for HTML:
	<pre><code class="lang-css">
		ins, del { text-decoration-skip: none; }
	</code></pre>

	When the value of the 'text-decoration-line' property is either
	''spelling-error'' or ''grammar-error'',
	the UA may ignore the value of 'text-decoration-skip'.

<h4 id="text-decoration-skip-ink-property">
Text Decoration Line Continuity: the 'text-decoration-skip-ink' property</h4>

	<pre class="propdef">
	Name: text-decoration-skip-ink
	Value: auto | none
	Initial: ''auto''
	Applies to: all elements
	Inherited: yes
	Percentages: N/A
	Computed value: specified keyword
	Animation type: discrete
	</pre>

	This property controls how overlines and underlines are drawn
	when they cross over a glyph.

	When enabled, decoration lines skip over where glyphs are drawn:
	interrupt the decoration line to let the shape of the text show through
	where the text decoration would otherwise cross over a glyph.
	The UA must also skip a small distance to either side of the glyph outline.

	<div class="figure">
		<p><img title="text-decoration-skip: ink"
				alt="An alphabetic underline through Myanmar text skips around descenders and the vertical strokes of combining characters that drop below the alphabetic baseline."
				src="images/decoration-skip-ink.png"
				>
		<p class="caption">''text-decoration-skip: ink''</p>
	</div>

	<div class="issue">
		Ideographic scripts do not want to skip when ''text-decoration-skip-ink/auto''.
		How can we define this behavior?
		Are there more scripts wanting not to skip?
		Need some normative text describe how ''text-decoration-skip-ink/auto'' works.
		See
		<a href="https://lists.w3.org/Archives/Public/www-style/2017Feb/0069.html">telcon minutes</a>,
		<a href="https://github.com/w3c/alreq/issues/86">alreq#86</a>,
		<a href="https://github.com/w3c/csswg-drafts/issues/1288">csswg#1288</a>
	</div>

	This property only applies to overlines and underlines;
	line-throughs are unaffected.

	<dl>
		<dt><dfn value for="text-decoration-skip-ink">auto</dfn></dt>
		<dd>
			UA should skip over where glyphs are drawn.

		<dt><dfn value for="text-decoration-skip-ink">none</dfn></dt>
		<dd>
			UA must draw contiguous lines without interruptions,
			even when they cross over a glyph.

	</dl>

<h2 id="text-shadow-property">
Additional Controls for Text Shadows</h2>

	Level 4 adds a spread radius argument to 'text-shadow',
	using the same syntax and interpretation as for 'box-shadow',
	except that corners are always rounded
	(since the geometry of a glyph is not so simple as a box).

<h2 id="emphasis-marks">
Additional Controls for Emphasis Marks</h2>

	Issue: See also <a href="https://github.com/w3c/csswg-drafts/issues/1892">issue about continuity in size/position</a>.

<h3 id="text-emphasis-skip">
Emphasis Mark Skip: the 'text-emphasis-skip' property</h3>

	<p class="issue">This section is under brainstorming.
	It's also not yet clear if this property is needed quite yet, despite differences in desired behavior among publications.

	<pre class="propdef">
	Name: text-emphasis-skip
	Value: spaces || punctuation || symbols || narrow
	Initial: spaces punctuation
	Applies to: all elements
	Inherited: yes
	Percentages: N/A
	Computed value: specified keyword(s)
	Animation type: discrete
	</pre>

	This property describes for which characters marks are drawn.
	The values have following meanings:

	<dl for=text-emphasis-skip type=value>
		<dt><dfn>spaces</dfn>
		<dd>
			Skip <a href="https://www.w3.org/TR/css-text/#word-separator">word separators</a> or other <a>characters</a>
			belonging to the Unicode separator category (Z*).
			(But note that emphasis marks <em>are</em> drawn for a space
			 that combines with any combining characters.)

		<dt><dfn>punctuation</dfn>
		<dd>
			Skip punctuation.
			Punctuation in this definition includes characters belonging to
			the Unicode P* category
			that are not defined as ''symbols'' (see below).

		<dt><dfn>symbols</dfn>
		<dd>Skip symbols.
			Symbols in this definition includes
			all <a>typographic character units</a> belonging to
			the Unicode S* <a>general category</a>
			as well as any which are <code>NFKD</code>-equivalent [[!UAX15]]
			to the following <a>characters</a> from the Unicode Po category:

			<table class="data">
				<tr><td>#	<td>U+0023	<td>NUMBER SIGN
				<tr><td>%	<td>U+0025	<td>PERCENT SIGN
				<tr><td>‰	<td>U+2030	<td>PER MILLE SIGN
				<tr><td>‱	<td>U+2031	<td>PER TEN THOUSAND SIGN
				<tr><td>٪	<td>U+066A	<td>ARABIC PERCENT SIGN
				<tr><td>؉	<td>U+0609	<td>ARABIC-INDIC PER MILLE SIGN
				<tr><td>؊	<td>U+060A	<td>ARABIC-INDIC PER TEN THOUSAND SIGN
				<tr><td>&	<td>U+0026	<td>AMPERSAND
				<tr><td>⁊	<td>U+204A	<td>TIRONIAN SIGN E[[
				<tr><td>@	<td>U+0040	<td>COMMERCIAL AT
				<tr><td>§	<td>U+00A7	<td>SECTION SIGN
				<tr><td>¶	<td>U+00B6	<td>PILCROW SIGN
				<tr><td>⁋	<td>U+204B	<td>REVERSED PILCROW SIGN
				<tr><td>⁓	<td>U+2053	<td>SWUNG DASH
				<tr><td>〽️	<td>U+303D	<td>PART ALTERNATION MARK
			</table>

		<dt><dfn>narrow</dfn>
		<dd>Skip characters where the <code>East_Asian_Width</code> property [[!UAX11]]
			of the Unicode database [[!UAX44]] is not F (Fullwidth) or W (Wide).
	</dl>

	Characters belonging to the Unicode classes for control codes
	and unassigned characters (Cc, Cf, Cn) are skipped
	regardless of the value of this property.

	<p class="issue">This syntax requires UA to implement drawing marks for spaces.
	Is there any use case for doing so?
	If not, should we modify the syntax not to allow drawing marks for spaces?

	Issue: See also <a href="https://github.com/w3c/csswg-drafts/issues/839">discussion of the initial value</a>.

<!--

Some notes from Koji :

	Here's what Kobayashi-sensei and I've got.

	We have categorized to:
	1. Controls
	2. Spaces
	3. Connectors
	4. Symbols
	5. Delimiters

	>From these groups, his recommendation is not to put emphasis marks to any of these by default, including symbols.

	1 is C* except Co as we discussed, and 2 is Z*. These are easy.

	3: Connectors are Pc and Pd, plus U+30FB KATAKANA MIDDLE DOT. They are used to "connect", rather than "delimit".

	4: Symbols include more than we have in the spec; #, &, %, @, $, ...

	5: Delimiters are comma, full-stops, parenthesis, etc.; they're used to "delimit".

	Category Po is tough one, as I expected (and you might as well I guess :). By looking at his examples, it has 3, 4, and 5, all mixed.

	Here're options I came up:

	OPTION 1: Categorize every code point of Po (there are 402) into 3, 4, and 5, and list them up in the spec.
	OPTION 2: UAX #29 Text Segmentation: Sentence=Close|ATerm|SContinue|STerm are 5, in addition to Ps, Pe, Pi, Pf, and other Po are 4.
	OPTION 3: More simplified; just make all Po as 4: Symbols. It includes full-stops for instance which is not ideal, but simple. Either way, default is ok (if we make symbols to skip by default as Kobayashi-sensei suggested.)

	My preference is OPTION 2, I'm ok with 3. I don't like 1. What do you think?

	U+30FB still cannot be handled, so we could make it as the only exception, but I think just ignoring it is also acceptable (authors still can specify "keep-symbol" to put emphasis marks on them.)

	Three more things I'd like to have your opinions:
	1. Name of value for "connectors": connectors, dashes, hyphens?
	2. What do you think to skip-narrow by default? I have no idea how common emphasis marks for Tibetan is, but his definition includes skip-narrow.
	3. If we take Kobayashi-sensei's list, skip-symbols is also default, so most values other than skip-narrow is "keep-*". Maybe we should change property name?

	I'm copying all Sentence=Close|ATerm|SContinue|STerm for your reference, but you can play with the spreadsheet either on Windows Live or Google docs if you'd like:
	http://cid-1dfc0a803975458e.office.live.com/edit.aspx/.Public/Unicode.xlsx
	https://spreadsheets.google.com/ccc?key=0Ai2NamWX-WptdGpGZW9BdkhnVkVTTXFpMzhQTEloZ2c

	0021	EXCLAMATION MARK	Po	STerm
	0022	QUOTATION MARK	Po	Close
	0027	APOSTROPHE	Po	Close
	0028	LEFT PARENTHESIS	Ps	Close
	0029	RIGHT PARENTHESIS	Pe	Close
	002C	COMMA	Po	SContinue
	002D	HYPHEN-MINUS	Pd	SContinue
	002E	FULL STOP	Po	ATerm
	003A	COLON	Po	SContinue
	003F	QUESTION MARK	Po	STerm
	005B	LEFT SQUARE BRACKET	Ps	Close
	005D	RIGHT SQUARE BRACKET	Pe	Close
	007B	LEFT CURLY BRACKET	Ps	Close
	007D	RIGHT CURLY BRACKET	Pe	Close
	00AB	LEFT-POINTING DOUBLE ANGLE QUOTATION MARK	Pi	Close
	00BB	RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK	Pf	Close
	055C	ARMENIAN EXCLAMATION MARK	Po	STerm
	055D	ARMENIAN COMMA	Po	SContinue
	055E	ARMENIAN QUESTION MARK	Po	STerm
	0589	ARMENIAN FULL STOP	Po	STerm
	060C	ARABIC COMMA	Po	SContinue
	060D	ARABIC DATE SEPARATOR	Po	SContinue
	061F	ARABIC QUESTION MARK	Po	STerm
	06D4	ARABIC FULL STOP	Po	STerm
	0700	SYRIAC END OF PARAGRAPH	Po	STerm
	0701	SYRIAC SUPRALINEAR FULL STOP	Po	STerm
	0702	SYRIAC SUBLINEAR FULL STOP	Po	STerm
	07F8	NKO COMMA	Po	SContinue
	07F9	NKO EXCLAMATION MARK	Po	STerm
	0964	DEVANAGARI DANDA	Po	STerm
	0965	DEVANAGARI DOUBLE DANDA	Po	STerm
	0F3A	TIBETAN MARK GUG RTAGS GYON	Ps	Close
	0F3B	TIBETAN MARK GUG RTAGS GYAS	Pe	Close
	0F3C	TIBETAN MARK ANG KHANG GYON	Ps	Close
	0F3D	TIBETAN MARK ANG KHANG GYAS	Pe	Close
	104A	MYANMAR SIGN LITTLE SECTION	Po	STerm
	104B	MYANMAR SIGN SECTION	Po	STerm
	1362	ETHIOPIC FULL STOP	Po	STerm
	1367	ETHIOPIC QUESTION MARK	Po	STerm
	1368	ETHIOPIC PARAGRAPH SEPARATOR	Po	STerm
	166E	CANADIAN SYLLABICS FULL STOP	Po	STerm
	169B	OGHAM FEATHER MARK	Ps	Close
	169C	OGHAM REVERSED FEATHER MARK	Pe	Close
	1735	PHILIPPINE SINGLE PUNCTUATION	Po	STerm
	1736	PHILIPPINE DOUBLE PUNCTUATION	Po	STerm
	1802	MONGOLIAN COMMA	Po	SContinue
	1803	MONGOLIAN FULL STOP	Po	STerm
	1808	MONGOLIAN MANCHU COMMA	Po	SContinue
	1809	MONGOLIAN MANCHU FULL STOP	Po	STerm
	1944	LIMBU EXCLAMATION MARK	Po	STerm
	1945	LIMBU QUESTION MARK	Po	STerm
	1AA8	TAI THAM SIGN KAAN	Po	STerm
	1AA9	TAI THAM SIGN KAANKUU	Po	STerm
	1AAA	TAI THAM SIGN SATKAAN	Po	STerm
	1AAB	TAI THAM SIGN SATKAANKUU	Po	STerm
	1B5A	BALINESE PANTI	Po	STerm
	1B5B	BALINESE PAMADA	Po	STerm
	1B5E	BALINESE CARIK SIKI	Po	STerm
	1B5F	BALINESE CARIK PAREREN	Po	STerm
	1C3B	LEPCHA PUNCTUATION TA-ROL	Po	STerm
	1C3C	LEPCHA PUNCTUATION NYET THYOOM TA-ROL	Po	STerm
	1C7E	OL CHIKI PUNCTUATION MUCAAD	Po	STerm
	1C7F	OL CHIKI PUNCTUATION DOUBLE MUCAAD	Po	STerm
	2013	EN DASH	Pd	SContinue
	2014	EM DASH	Pd	SContinue
	2018	LEFT SINGLE QUOTATION MARK	Pi	Close
	2019	RIGHT SINGLE QUOTATION MARK	Pf	Close
	201A	SINGLE LOW-9 QUOTATION MARK	Ps	Close
	201B	SINGLE HIGH-REVERSED-9 QUOTATION MARK	Pi	Close
	201C	LEFT DOUBLE QUOTATION MARK	Pi	Close
	201D	RIGHT DOUBLE QUOTATION MARK	Pf	Close
	201E	DOUBLE LOW-9 QUOTATION MARK	Ps	Close
	201F	DOUBLE HIGH-REVERSED-9 QUOTATION MARK	Pi	Close
	2024	ONE DOT LEADER	Po	ATerm
	2039	SINGLE LEFT-POINTING ANGLE QUOTATION MARK	Pi	Close
	203A	SINGLE RIGHT-POINTING ANGLE QUOTATION MARK	Pf	Close
	203C	DOUBLE EXCLAMATION MARK	Po	STerm
	203D	INTERROBANG	Po	STerm
	2045	LEFT SQUARE BRACKET WITH QUILL	Ps	Close
	2046	RIGHT SQUARE BRACKET WITH QUILL	Pe	Close
	2047	DOUBLE QUESTION MARK	Po	STerm
	2048	QUESTION EXCLAMATION MARK	Po	STerm
	2049	EXCLAMATION QUESTION MARK	Po	STerm
	207D	SUPERSCRIPT LEFT PARENTHESIS	Ps	Close
	207E	SUPERSCRIPT RIGHT PARENTHESIS	Pe	Close
	208D	SUBSCRIPT LEFT PARENTHESIS	Ps	Close
	208E	SUBSCRIPT RIGHT PARENTHESIS	Pe	Close
	2329	LEFT-POINTING ANGLE BRACKET	Ps	Close
	232A	RIGHT-POINTING ANGLE BRACKET	Pe	Close
	275B	HEAVY SINGLE TURNED COMMA QUOTATION MARK ORNAMENT	So	Close
	275C	HEAVY SINGLE COMMA QUOTATION MARK ORNAMENT	So	Close
	275D	HEAVY DOUBLE TURNED COMMA QUOTATION MARK ORNAMENT	So	Close
	275E	HEAVY DOUBLE COMMA QUOTATION MARK ORNAMENT	So	Close
	2768	MEDIUM LEFT PARENTHESIS ORNAMENT	Ps	Close
	2769	MEDIUM RIGHT PARENTHESIS ORNAMENT	Pe	Close
	276A	MEDIUM FLATTENED LEFT PARENTHESIS ORNAMENT	Ps	Close
	276B	MEDIUM FLATTENED RIGHT PARENTHESIS ORNAMENT	Pe	Close
	276C	MEDIUM LEFT-POINTING ANGLE BRACKET ORNAMENT	Ps	Close
	276D	MEDIUM RIGHT-POINTING ANGLE BRACKET ORNAMENT	Pe	Close
	276E	HEAVY LEFT-POINTING ANGLE QUOTATION MARK ORNAMENT	Ps	Close
	276F	HEAVY RIGHT-POINTING ANGLE QUOTATION MARK ORNAMENT	Pe	Close
	2770	HEAVY LEFT-POINTING ANGLE BRACKET ORNAMENT	Ps	Close
	2771	HEAVY RIGHT-POINTING ANGLE BRACKET ORNAMENT	Pe	Close
	2772	LIGHT LEFT TORTOISE SHELL BRACKET ORNAMENT	Ps	Close
	2773	LIGHT RIGHT TORTOISE SHELL BRACKET ORNAMENT	Pe	Close
	2774	MEDIUM LEFT CURLY BRACKET ORNAMENT	Ps	Close
	2775	MEDIUM RIGHT CURLY BRACKET ORNAMENT	Pe	Close
	27C5	LEFT S-SHAPED BAG DELIMITER	Ps	Close
	27C6	RIGHT S-SHAPED BAG DELIMITER	Pe	Close
	27E6	MATHEMATICAL LEFT WHITE SQUARE BRACKET	Ps	Close
	27E7	MATHEMATICAL RIGHT WHITE SQUARE BRACKET	Pe	Close
	27E8	MATHEMATICAL LEFT ANGLE BRACKET	Ps	Close
	27E9	MATHEMATICAL RIGHT ANGLE BRACKET	Pe	Close
	27EA	MATHEMATICAL LEFT DOUBLE ANGLE BRACKET	Ps	Close
	27EB	MATHEMATICAL RIGHT DOUBLE ANGLE BRACKET	Pe	Close
	27EC	MATHEMATICAL LEFT WHITE TORTOISE SHELL BRACKET	Ps	Close
	27ED	MATHEMATICAL RIGHT WHITE TORTOISE SHELL BRACKET	Pe	Close
	27EE	MATHEMATICAL LEFT FLATTENED PARENTHESIS	Ps	Close
	27EF	MATHEMATICAL RIGHT FLATTENED PARENTHESIS	Pe	Close
	2983	LEFT WHITE CURLY BRACKET	Ps	Close
	2984	RIGHT WHITE CURLY BRACKET	Pe	Close
	2985	LEFT WHITE PARENTHESIS	Ps	Close
	2986	RIGHT WHITE PARENTHESIS	Pe	Close
	2987	Z NOTATION LEFT IMAGE BRACKET	Ps	Close
	2988	Z NOTATION RIGHT IMAGE BRACKET	Pe	Close
	2989	Z NOTATION LEFT BINDING BRACKET	Ps	Close
	298A	Z NOTATION RIGHT BINDING BRACKET	Pe	Close
	298B	LEFT SQUARE BRACKET WITH UNDERBAR	Ps	Close
	298C	RIGHT SQUARE BRACKET WITH UNDERBAR	Pe	Close
	298D	LEFT SQUARE BRACKET WITH TICK IN TOP CORNER	Ps	Close
	298E	RIGHT SQUARE BRACKET WITH TICK IN BOTTOM CORNER	Pe	Close
	298F	LEFT SQUARE BRACKET WITH TICK IN BOTTOM CORNER	Ps	Close
	2990	RIGHT SQUARE BRACKET WITH TICK IN TOP CORNER	Pe	Close
	2991	LEFT ANGLE BRACKET WITH DOT	Ps	Close
	2992	RIGHT ANGLE BRACKET WITH DOT	Pe	Close
	2993	LEFT ARC LESS-THAN BRACKET	Ps	Close
	2994	RIGHT ARC GREATER-THAN BRACKET	Pe	Close
	2995	DOUBLE LEFT ARC GREATER-THAN BRACKET	Ps	Close
	2996	DOUBLE RIGHT ARC LESS-THAN BRACKET	Pe	Close
	2997	LEFT BLACK TORTOISE SHELL BRACKET	Ps	Close
	2998	RIGHT BLACK TORTOISE SHELL BRACKET	Pe	Close
	29D8	LEFT WIGGLY FENCE	Ps	Close
	29D9	RIGHT WIGGLY FENCE	Pe	Close
	29DA	LEFT DOUBLE WIGGLY FENCE	Ps	Close
	29DB	RIGHT DOUBLE WIGGLY FENCE	Pe	Close
	29FC	LEFT-POINTING CURVED ANGLE BRACKET	Ps	Close
	29FD	RIGHT-POINTING CURVED ANGLE BRACKET	Pe	Close
	2E00	RIGHT ANGLE SUBSTITUTION MARKER	Po	Close
	2E01	RIGHT ANGLE DOTTED SUBSTITUTION MARKER	Po	Close
	2E02	LEFT SUBSTITUTION BRACKET	Pi	Close
	2E03	RIGHT SUBSTITUTION BRACKET	Pf	Close
	2E04	LEFT DOTTED SUBSTITUTION BRACKET	Pi	Close
	2E05	RIGHT DOTTED SUBSTITUTION BRACKET	Pf	Close
	2E06	RAISED INTERPOLATION MARKER	Po	Close
	2E07	RAISED DOTTED INTERPOLATION MARKER	Po	Close
	2E08	DOTTED TRANSPOSITION MARKER	Po	Close
	2E09	LEFT TRANSPOSITION BRACKET	Pi	Close
	2E0A	RIGHT TRANSPOSITION BRACKET	Pf	Close
	2E0B	RAISED SQUARE	Po	Close
	2E0C	LEFT RAISED OMISSION BRACKET	Pi	Close
	2E0D	RIGHT RAISED OMISSION BRACKET	Pf	Close
	2E1C	LEFT LOW PARAPHRASE BRACKET	Pi	Close
	2E1D	RIGHT LOW PARAPHRASE BRACKET	Pf	Close
	2E20	LEFT VERTICAL BAR WITH QUILL	Pi	Close
	2E21	RIGHT VERTICAL BAR WITH QUILL	Pf	Close
	2E22	TOP LEFT HALF BRACKET	Ps	Close
	2E23	TOP RIGHT HALF BRACKET	Pe	Close
	2E24	BOTTOM LEFT HALF BRACKET	Ps	Close
	2E25	BOTTOM RIGHT HALF BRACKET	Pe	Close
	2E26	LEFT SIDEWAYS U BRACKET	Ps	Close
	2E27	RIGHT SIDEWAYS U BRACKET	Pe	Close
	2E28	LEFT DOUBLE PARENTHESIS	Ps	Close
	2E29	RIGHT DOUBLE PARENTHESIS	Pe	Close
	2E2E	REVERSED QUESTION MARK	Po	STerm
	3001	IDEOGRAPHIC COMMA	Po	SContinue
	3002	IDEOGRAPHIC FULL STOP	Po	STerm
	3008	LEFT ANGLE BRACKET	Ps	Close
	3009	RIGHT ANGLE BRACKET	Pe	Close
	300A	LEFT DOUBLE ANGLE BRACKET	Ps	Close
	300B	RIGHT DOUBLE ANGLE BRACKET	Pe	Close
	300C	LEFT CORNER BRACKET	Ps	Close
	300D	RIGHT CORNER BRACKET	Pe	Close
	300E	LEFT WHITE CORNER BRACKET	Ps	Close
	300F	RIGHT WHITE CORNER BRACKET	Pe	Close
	3010	LEFT BLACK LENTICULAR BRACKET	Ps	Close
	3011	RIGHT BLACK LENTICULAR BRACKET	Pe	Close
	3014	LEFT TORTOISE SHELL BRACKET	Ps	Close
	3015	RIGHT TORTOISE SHELL BRACKET	Pe	Close
	3016	LEFT WHITE LENTICULAR BRACKET	Ps	Close
	3017	RIGHT WHITE LENTICULAR BRACKET	Pe	Close
	3018	LEFT WHITE TORTOISE SHELL BRACKET	Ps	Close
	3019	RIGHT WHITE TORTOISE SHELL BRACKET	Pe	Close
	301A	LEFT WHITE SQUARE BRACKET	Ps	Close
	301B	RIGHT WHITE SQUARE BRACKET	Pe	Close
	301D	REVERSED DOUBLE PRIME QUOTATION MARK	Ps	Close
	301E	DOUBLE PRIME QUOTATION MARK	Pe	Close
	301F	LOW DOUBLE PRIME QUOTATION MARK	Pe	Close
	A4FF	LISU PUNCTUATION FULL STOP	Po	STerm
	A60E	VAI FULL STOP	Po	STerm
	A60F	VAI QUESTION MARK	Po	STerm
	A6F3	BAMUM FULL STOP	Po	STerm
	A6F7	BAMUM QUESTION MARK	Po	STerm
	A876	PHAGS-PA MARK SHAD	Po	STerm
	A877	PHAGS-PA MARK DOUBLE SHAD	Po	STerm
	A8CE	SAURASHTRA DANDA	Po	STerm
	A8CF	SAURASHTRA DOUBLE DANDA	Po	STerm
	A92F	KAYAH LI SIGN SHYA	Po	STerm
	A9C8	JAVANESE PADA LINGSA	Po	STerm
	A9C9	JAVANESE PADA LUNGSI	Po	STerm
	AA5D	CHAM PUNCTUATION DANDA	Po	STerm
	AA5E	CHAM PUNCTUATION DOUBLE DANDA	Po	STerm
	AA5F	CHAM PUNCTUATION TRIPLE DANDA	Po	STerm
	ABEB	MEETEI MAYEK CHEIKHEI	Po	STerm
	FD3E	ORNATE LEFT PARENTHESIS	Ps	Close
	FD3F	ORNATE RIGHT PARENTHESIS	Pe	Close
	FE10	PRESENTATION FORM FOR VERTICAL COMMA	Po	SContinue
	FE11	PRESENTATION FORM FOR VERTICAL IDEOGRAPHIC COMMA	Po	SContinue
	FE13	PRESENTATION FORM FOR VERTICAL COLON	Po	SContinue
	FE17	PRESENTATION FORM FOR VERTICAL LEFT WHITE LENTICULAR BRACKET	Ps	Close
	FE18	PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET	Pe	Close
	FE31	PRESENTATION FORM FOR VERTICAL EM DASH	Pd	SContinue
	FE32	PRESENTATION FORM FOR VERTICAL EN DASH	Pd	SContinue
	FE35	PRESENTATION FORM FOR VERTICAL LEFT PARENTHESIS	Ps	Close
	FE36	PRESENTATION FORM FOR VERTICAL RIGHT PARENTHESIS	Pe	Close
	FE37	PRESENTATION FORM FOR VERTICAL LEFT CURLY BRACKET	Ps	Close
	FE38	PRESENTATION FORM FOR VERTICAL RIGHT CURLY BRACKET	Pe	Close
	FE39	PRESENTATION FORM FOR VERTICAL LEFT TORTOISE SHELL BRACKET	Ps	Close
	FE3A	PRESENTATION FORM FOR VERTICAL RIGHT TORTOISE SHELL BRACKET	Pe	Close
	FE3B	PRESENTATION FORM FOR VERTICAL LEFT BLACK LENTICULAR BRACKET	Ps	Close
	FE3C	PRESENTATION FORM FOR VERTICAL RIGHT BLACK LENTICULAR BRACKET	Pe	Close
	FE3D	PRESENTATION FORM FOR VERTICAL LEFT DOUBLE ANGLE BRACKET	Ps	Close
	FE3E	PRESENTATION FORM FOR VERTICAL RIGHT DOUBLE ANGLE BRACKET	Pe	Close
	FE3F	PRESENTATION FORM FOR VERTICAL LEFT ANGLE BRACKET	Ps	Close
	FE40	PRESENTATION FORM FOR VERTICAL RIGHT ANGLE BRACKET	Pe	Close
	FE41	PRESENTATION FORM FOR VERTICAL LEFT CORNER BRACKET	Ps	Close
	FE42	PRESENTATION FORM FOR VERTICAL RIGHT CORNER BRACKET	Pe	Close
	FE43	PRESENTATION FORM FOR VERTICAL LEFT WHITE CORNER BRACKET	Ps	Close
	FE44	PRESENTATION FORM FOR VERTICAL RIGHT WHITE CORNER BRACKET	Pe	Close
	FE47	PRESENTATION FORM FOR VERTICAL LEFT SQUARE BRACKET	Ps	Close
	FE48	PRESENTATION FORM FOR VERTICAL RIGHT SQUARE BRACKET	Pe	Close
	FE50	SMALL COMMA	Po	SContinue
	FE51	SMALL IDEOGRAPHIC COMMA	Po	SContinue
	FE52	SMALL FULL STOP	Po	ATerm
	FE55	SMALL COLON	Po	SContinue
	FE56	SMALL QUESTION MARK	Po	STerm
	FE57	SMALL EXCLAMATION MARK	Po	STerm
	FE58	SMALL EM DASH	Pd	SContinue
	FE59	SMALL LEFT PARENTHESIS	Ps	Close
	FE5A	SMALL RIGHT PARENTHESIS	Pe	Close
	FE5B	SMALL LEFT CURLY BRACKET	Ps	Close
	FE5C	SMALL RIGHT CURLY BRACKET	Pe	Close
	FE5D	SMALL LEFT TORTOISE SHELL BRACKET	Ps	Close
	FE5E	SMALL RIGHT TORTOISE SHELL BRACKET	Pe	Close
	FE63	SMALL HYPHEN-MINUS	Pd	SContinue
	FF01	FULLWIDTH EXCLAMATION MARK	Po	STerm
	FF08	FULLWIDTH LEFT PARENTHESIS	Ps	Close
	FF09	FULLWIDTH RIGHT PARENTHESIS	Pe	Close
	FF0C	FULLWIDTH COMMA	Po	SContinue
	FF0D	FULLWIDTH HYPHEN-MINUS	Pd	SContinue
	FF0E	FULLWIDTH FULL STOP	Po	ATerm
	FF1A	FULLWIDTH COLON	Po	SContinue
	FF1F	FULLWIDTH QUESTION MARK	Po	STerm
	FF3B	FULLWIDTH LEFT SQUARE BRACKET	Ps	Close
	FF3D	FULLWIDTH RIGHT SQUARE BRACKET	Pe	Close
	FF5B	FULLWIDTH LEFT CURLY BRACKET	Ps	Close
	FF5D	FULLWIDTH RIGHT CURLY BRACKET	Pe	Close
	FF5F	FULLWIDTH LEFT WHITE PARENTHESIS	Ps	Close
	FF60	FULLWIDTH RIGHT WHITE PARENTHESIS	Pe	Close
	FF61	HALFWIDTH IDEOGRAPHIC FULL STOP	Po	STerm
	FF62	HALFWIDTH LEFT CORNER BRACKET	Ps	Close
	FF63	HALFWIDTH RIGHT CORNER BRACKET	Pe	Close
	FF64	HALFWIDTH IDEOGRAPHIC COMMA	Po	SContinue
	10A56	KHAROSHTHI PUNCTUATION DANDA	Po	STerm
	10A57	KHAROSHTHI PUNCTUATION DOUBLE DANDA	Po	STerm
	11047	BRAHMI DANDA	Po	STerm
	11048	BRAHMI DOUBLE DANDA	Po	STerm
	110BE	KAITHI SECTION MARK	Po	STerm
	110BF	KAITHI DOUBLE SECTION MARK	Po	STerm
	110C0	KAITHI DANDA	Po	STerm
	110C1	KAITHI DOUBLE DANDA	Po	STerm

-->

Privacy and Security Considerations {#priv-sec}
===============================================

This specification introduces no new privacy or security considerations.