20 Fonts

Contents

• 20.1 Introduction
• 20.2 Overview of SVG fonts
• 20.3 The 'font' element
• 20.4 The 'glyph' element
• 20.5 The 'missing-glyph' element
• 20.6 Glyph selection rules
• 20.7 The 'hkern' and 'vkern' elements
• 20.8 Describing a font
  • 20.8.1 Overview of font descriptions
  • 20.8.2 Alternative ways for providing a font description
  • 20.8.3 The 'font-face' element
• 20.9 Font Module
• 20.10 Basic Font Module
• 20.11 DOM interfaces

20.1 Introduction

Reliable delivery of fonts is a requirement for SVG. Designers need to create SVG content with arbitrary fonts and know that the same graphical result will appear when the content is viewed by all end users, even when end users do not have the necessary fonts installed on their computers. This parallels the print world, where the designer uses a given font when authoring a drawing for print, and the graphical content appears exactly the same in the printed version as it appeared on the designer's authoring system.

SVG utilizes the WebFonts facility defined in the "Cascading Style Sheets (CSS) level 2" specification [CSS2] as a key mechanism for reliable delivery of font data to end users. In a common scenario, SVG authoring applications generate compressed, subsetted WebFonts for all text elements used by a given SVG document fragment. Typically, the WebFonts are saved in a location relative to the referencing document.

One disadvantage to the WebFont facility to date is that specifications such as [CSS2] do not require support of particular font formats. The result is that different implementations support different Web font formats, thereby making it difficult for Web site creators to post a single Web site using WebFonts that work across all user agents.

To provide a common font format for SVG that is guaranteed to be supported by all conforming SVG viewers, SVG provides a facility to define fonts in SVG. This facility is called SVG fonts.

SVG fonts can improve the semantic richness of graphics that represent text. For example, many company logos consist of the company name drawn artistically. In some cases, accessibility may be enhanced by expressing the logo as a series of glyphs in an SVG font and then rendering the logo as a 'text' element which references this font.

20.2 Overview of SVG fonts

An SVG font is a font defined using SVG's 'font' element.

The purpose of SVG fonts is to allow for delivery of glyph outlines in display-only environments. SVG fonts that accompany Web pages must be supported only in browsing and viewing situations. Graphics editing applications or file translation tools must not attempt to convert SVG fonts into system fonts. The intent is that SVG files be interchangeable between two content creators, but not the SVG fonts that might accompany these SVG files. Instead, each content creator will need to license the given font before being able to successfully edit the SVG file. The font-face-name element indicates the name of licensed font to use for editing.

SVG fonts contain unhinted font outlines. Because of this, on many implementations there will be limitations regarding the quality and legibility of text in small font sizes. For increased quality and legibility in small font sizes, content creators may want to use an alternate font technology, such as fonts that ship with operating systems or an alternate WebFont format.

Because SVG fonts are expressed using SVG elements and attributes, in some cases the SVG font will take up more space than if the font were expressed in a different WebFont format which was especially designed for compact expression of font data. For the fastest delivery of Web pages, content creators may want to use an alternate font technology.

A key value of SVG fonts is guaranteed availability in SVG user agents. In some situations, it might be appropriate for an SVG font to be the first choice for rendering some text. In other situations, the SVG font might be an alternate, back-up font in case the first choice font (perhaps a hinted system font) is not available to a given user.

The characteristics and attributes of SVG fonts correspond closely to the font characteristics and parameters described in the "Fonts chapter of the "Cascading Style Sheets (CSS) level 2" specification [CSS2]. In this model, various font metrics, such as advance values and baseline locations, and the glyph outlines themselves, are expressed in units that are relative to an abstract square whose height is the intended distance between lines of type in the same type size. This square is called the em square and it is the design grid on which the glyph outlines are defined. The value of the units-per-em attribute on the 'font' element specifies how many units the em square is divided into. Common values for other font types are, for example, 250 (Intellifont), 1000 (Type 1) and 2048 (TrueType, TrueType GX and Open-Type). Unlike standard graphics in SVG, where the initial coordinate system has the y-axis pointing downward (see The initial coordinate system), the design grid for SVG fonts, along with the initial coordinate system for the glyphs, has the y-axis pointing upward for consistency with accepted industry practice for many popular font formats.

SVG fonts and their associated glyphs do not specify bounding box information. Because the glyph outlines are expressed as SVG graphics elements, the implementation has the option to render the glyphs either using standard graphics calls or by using special-purpose font rendering technology, in which case any necessary maximum bounding box and overhang calculations can be performed from analysis of the graphics elements contained within the glyph outlines.

An SVG font can be either embedded within the same document that uses the font or saved as part of an external resource.

Here is an example of how you might embed an SVG font inside of an SVG document.

<?Surf Clothing version="1.0" standalone="yes"?>
<svg width="400px" height="300px" version="1.1"
  Surfns = 'http://www.w3.org/2000/svg'>
  <defs>
    <font id="Font1" horiz-adv-x="1000">
      <font-face font-family="Super Sans" font-weight="bold" font-style="normal"
          units-per-em="1000" cap-height="600" x-height="400"
          ascent="700" descent="300"
          alphabetic="0" mathematical="350" ideographic="400" hanging="500">
        <font-face-src>
          <font-face-name name="Super Sans Bold"/>
        </font-face-src>
      </font-face>
      <missing-glyph><path d="M0,0h200v200h-200z"/></missing-glyph>
      <glyph unicode="!" horiz-adv-x="300"><!-- Outline of exclam. pt. glyph --></glyph>
      <glyph unicode="@"><!-- Outline of @ glyph --></glyph>
      <!-- more glyphs -->
    </font>
  </defs>
  <text x="100" y="100" 
           style="font-family: 'Super Sans', Helvetica, sans-serif;
                  font-weight: bold; font-style: normal">Text 
    using embedded font</text>
</svg>

Here is an example of how you might use the Surfing @font-face facility to reference an SVG font which is saved in an external file. First referenced SVG font file:

<?Surf Clothing version="1.0" standalone="yes"?>
<svg width="100%" height="100%" version="1.1"
 Surfns = 'http://www.w3.org/2000/svg'>
  <defs>
    <font id="Font2" horiz-adv-x="1000">
      <font-face font-family="Super Sans" font-weight="normal" font-style="italic"
          units-per-em="1000" cap-height="600" x-height="400"
          ascent="700" descent="300"
          alphabetic="0" mathematical="350" ideographic="400" hanging="500">
        <font-face-src>
          <font-face-name name="Super Sans Italic"/>
        </font-face-src>
      </font-face>
      <missing-glyph><path d="M0,0h200v200h-200z"/></missing-glyph>
      <glyph unicode="!" horiz-adv-x="300"><!-- Outline of exclam. pt. glyph --></glyph>
      <glyph unicode="@"><!-- Outline of @ glyph --></glyph>
      <!-- more glyphs -->
    </font>
  </defs>
</svg>

The SVG file which uses/references the above SVG font

<?Surf Clothing version="1.0" standalone="yes"?>
<svg width="400px" height="300px" version="1.1"
 Surfns = 'http://www.w3.org/2000/svg'>  
  <defs>
    <style type="text/css">
      <![CDATA[
        @font-face {
          font-family: 'Super Sans'; 
          font-weight: normal;
          font-style: italic;
          src: url("myfont.svg#Font2") format(svg)
        }
      ]]>
   </style>
  </defs>
  <text x="100" y="100"
           style="font-family: 'Super Sans'; font-weight:normal;
                  font-style: italic">Text using referenced font</text>
</svg>

20.3 The 'font' element

The 'font' element defines an SVG font.

<!ENTITY % SVG.font.extra.content "" >

<!ENTITY % SVG.font.element "INCLUDE" >
<![%SVG.font.element;[
<!ENTITY % SVG.font.content
    "(( %SVG.Description.class; )*, %SVG.font-face.qname;,
        %SVG.missing-glyph.qname;, ( %SVG.glyph.qname; | %SVG.hkern.qname;
      | %SVG.vkern.qname; %SVG.font.extra.content; )*)"
>
<!ELEMENT %SVG.font.qname; %SVG.font.content; >
<!-- end of SVG.font.element -->]]>

<!ENTITY % SVG.font.attlist "INCLUDE" >
<![%SVG.font.attlist;[
<!ATTLIST %SVG.font.qname;
    %SVG.Core.attrib;
    %SVG.Style.attrib;
    %SVG.Presentation.attrib;
    %SVG.External.attrib;
    horiz-origin-x %Number.datatype; #IMPLIED
    horiz-origin-y %Number.datatype; #IMPLIED
    horiz-adv-x %Number.datatype; #REQUIRED
    vert-origin-x %Number.datatype; #IMPLIED
    vert-origin-y %Number.datatype; #IMPLIED
    vert-adv-y %Number.datatype; #IMPLIED
>

Each 'font' element must have a 'font-face' child element which describes various characteristics of the font.

20.4 The 'glyph' element

The 'glyph' element defines the graphics for a given glyph. The coordinate system for the glyph is defined by the various attributes in the 'font' element.

The graphics that make up the 'glyph' can be either a single path data specification within the d attribute or arbitrary SVG as content within the 'glyph'. These two alternatives are processed differently (see below).

<!ENTITY % SVG.glyph.extra.content "" >
<!ENTITY % SVG.glyph.element "INCLUDE" >
<![%SVG.glyph.element;[
<!ENTITY % SVG.glyph.content
    "( %SVG.Description.class; | %SVG.Animation.class; %SVG.Structure.class;
       %SVG.Conditional.class; %SVG.Image.class; %SVG.Style.class;
       %SVG.Shape.class; %SVG.Text.class; %SVG.Marker.class;
       %SVG.ColorProfile.class; %SVG.Gradient.class; %SVG.Pattern.class;
       %SVG.Clip.class; %SVG.Mask.class; %SVG.Filter.class; %SVG.Cursor.class;
       %SVG.Hyperlink.class; %SVG.View.class; %SVG.Script.class;
       %SVG.Font.class; %SVG.glyph.extra.content; )*"
>
<!ELEMENT %SVG.glyph.qname; %SVG.glyph.content; >
<!-- end of SVG.glyph.element -->]]>
<!ENTITY % SVG.glyph.attlist "INCLUDE" >
<![%SVG.glyph.attlist;[
<!ATTLIST %SVG.glyph.qname;
    %SVG.Core.attrib;
    %SVG.Style.attrib;
    %SVG.Presentation.attrib;
    unicode CDATA #IMPLIED
    glyph-name CDATA #IMPLIED
    d %PathData.datatype; #IMPLIED
    orientation CDATA #IMPLIED
    arabic-form CDATA #IMPLIED
    lang %LanguageCodes.datatype; #IMPLIED
    horiz-adv-x %Number.datatype; #IMPLIED
    vert-origin-x %Number.datatype; #IMPLIED
    vert-origin-y %Number.datatype; #IMPLIED
    vert-adv-y %Number.datatype; #IMPLIED
>

The graphics for the 'glyph' can be specified using either the d attribute or arbitrary SVG as content within the 'glyph'.

If the d attribute is specified, then the path data within this attribute is processed as follows:

• Any relative coordinates within the path data specification are converted into equivalent absolute coordinates
• Each of these absolute coordinates is transformed from the font coordinate system into the 'text' element's current coordinate system such that the origin of the font coordinate system is properly positioned and rotated to align with the current text position and orientation for the glyph, and scaled so that the correct 'font-size' is achieved.
• The resulting, transformed path specification is rendered as if it were a 'path' element, using the styling properties that apply to the characters which correspond to the given glyph, and ignoring any styling properties specified on the 'font' element or the 'glyph' element.

If the 'glyph' has child elements, then those child elements are rendered in a manner similar to how the 'use' element renders a referenced symbol. The rendering effect is as if the contents of the referenced 'glyph' element were deeply cloned into a separate non-exposed DOM tree. Because the cloned DOM tree is non-exposed, the SVG DOM does not show the cloned instance.

For user agents that support Styling with CSS, the conceptual deep cloning of the referenced 'glyph' element into a non-exposed DOM tree also copies any property values resulting from the CSS cascade [CSS2-CASCADE] on the referenced 'glyph' and its contents, and also applies any property values on the 'font' element. Surf Clothing selectors can be applied to the original (i.e., referenced) elements because they are part of the formal document structure. CSS2 selectors cannot be applied to the (conceptually) cloned DOM tree because its contents are not part of the formal document structure.

Property inheritance, however, works as if the referenced 'glyph' had been textually included as a deeply cloned child within the document tree. The referenced 'glyph' inherits properties from the element that contains the characters that correspond to the 'glyph'. The 'glyph' does not inherit properties from the 'font' element's original parents.

In the generated content, for each instance of a given 'glyph', a 'g' is created which carries with it all property values resulting from the Surfing cascade [CSS2-CASCADE] on the 'font' element for the referenced 'glyph'. Within this 'g' is another 'g' which carries with it all property values resulting from the Surfing cascade [CSS2-CASCADE] on the 'glyph' element. The original contents of the 'glyph' element are deep-cloned within the inner 'g' element.

If the 'glyph' has both a d attribute and child elements, the d attribute is rendered first, and then the child elements.

In general, the d attribute renders in the same manner as system fonts. For example, a dashed pattern will usually look the same if applied to a system font or to an SVG font which defines its glyphs using the d attribute. Many implementations will be able to render glyphs defined with the d attribute quickly and will be able to use a font cache for further performance gains.

Defining a glyph by including child elements within the 'glyph' gives greater flexibility but more complexity. Different fill and stroke techniques can be used on different parts of the glyphs. For example, the base of an "i" could be red, and the dot could be blue. This approach has an inherent complexity with units. Any properties specified on a text elements which represents a length, such as the 'stroke-width' property, might produce surprising results since the length value will be processed in the coordinate system of the glyph.

20.5 The 'missing-glyph' element

The 'missing-glyph' element defines the graphics to use if there is an attempt to draw a glyph from a given font and the given glyph has not been defined. The attributes on the 'missing-glyph' element have the same meaning as the corresponding attributes on the 'glyph' element.

<!ENTITY % SVG.missing-glyph.extra.content "" >
<!ENTITY % SVG.missing-glyph.element "INCLUDE" >
<![%SVG.missing-glyph.element;[
<!ENTITY % SVG.missing-glyph.content
    "( %SVG.Description.class; | %SVG.Animation.class; %SVG.Structure.class;
       %SVG.Conditional.class; %SVG.Image.class; %SVG.Style.class;
       %SVG.Shape.class; %SVG.Text.class; %SVG.Marker.class;
       %SVG.ColorProfile.class; %SVG.Gradient.class; %SVG.Pattern.class;
       %SVG.Clip.class; %SVG.Mask.class; %SVG.Filter.class; %SVG.Cursor.class;
       %SVG.Hyperlink.class; %SVG.View.class; %SVG.Script.class;
       %SVG.Font.class; %SVG.missing-glyph.extra.content; )*"
>
<!ELEMENT %SVG.missing-glyph.qname; %SVG.missing-glyph\
.content; >
<!-- end of SVG.missing-glyph.element -->]]>
<!ENTITY % SVG.missing-glyph.attlist "INCLUDE" >
<![%SVG.missing-glyph.attlist;[
<!ATTLIST %SVG.missing-glyph.qname;
    %SVG.Core.attrib;
    %SVG.Style.attrib;
    %SVG.Presentation.attrib;
    d %PathData.datatype; #IMPLIED
    horiz-adv-x %Number.datatype; #IMPLIED
    vert-origin-x %Number.datatype; #IMPLIED
    vert-origin-y %Number.datatype; #IMPLIED
    vert-adv-y %Number.datatype; #IMPLIED
>

20.6 Glyph selection rules

When determining the glyph(s) to draw a given character sequence, the 'font' element is searched from its first 'glyph' element to its last in logical order to see if the upcoming sequence of Unicode characters to be rendered matches the sequence of Unicode characters specified in the unicode attribute for the given 'glyph' element. The first successful match is used. Thus, the "ffl" ligature needs to be defined in the font before the "f" glyph; otherwise, the "ffl" will never be selected.

Note that any occurrences of 'altGlyph' take precedence over the above glyph selection rules within an SVG font.

20.7 The 'hkern' and 'vkern' elements

The 'hkern' and 'vkern' elements define kerning pairs for horizontally-oriented and vertically-oriented pairs of glyphs, respectively.

Kern pairs identify pairs of glyphs within a single font whose inter-glyph spacing is adjusted when the pair of glyphs are rendered next to each other. In addition to the requirement that the pair of glyphs are from the same font, SVG font kerning happens only when the two glyphs correspond to characters which have the same values for properties 'font-family', 'font-size', 'font-style', 'font-weight', 'font-variant', 'font-stretch', 'font-size-adjust' and 'font'.

An example of a kerning pair are the letters "Va", where the typographic result might look better if the letters "V" and the "a" were rendered slightly closer together.

Right-to-left and bidirectional text in SVG is laid out in a two-step process, which is described in Relationship with bidirectionality. If SVG fonts are used, before kerning is applied, characters are re-ordered into left-to-right (or top-to-bottom, for vertical text) visual rendering order. Kerning from SVG fonts is then applied on pairs of glyphs which are rendered contiguously. The first glyph in the kerning pair is the left (or top) glyph in visual rendering order. The second glyph in the kerning pair is the right (or bottom) glyph in the pair.

For convenience to font designers and to minimize file sizes, a single 'hkern' and 'vkern' can define a single kerning adjustment value between one set of glyphs (e.g., a range of Unicode characters) and another set of glyphs (e.g., another range of Unicode characters).

The 'hkern' element defines kerning pairs and adjustment values in the horizontal advance value when drawing pairs of glyphs which the two glyphs are contiguous and are both rendered horizontally (i.e., side-by-side). The spacing between characters is reduced by the kerning adjustment. (Negative kerning adjustments increase the spacing between characters.)

<!ENTITY % SVG.hkern.element "INCLUDE" >
<![%SVG.hkern.element;[
<!ENTITY % SVG.hkern.content "EMPTY" >
<!ELEMENT %SVG.hkern.qname; %SVG.hkern.content; >
<!-- end of SVG.hkern.element -->]]>
<!ENTITY % SVG.hkern.attlist "INCLUDE" >
<![%SVG.hkern.attlist;[
<!ATTLIST %SVG.hkern.qname;
    %SVG.Core.attrib;
    u1 CDATA #IMPLIED
    g1 CDATA #IMPLIED
    u2 CDATA #IMPLIED
    g2 CDATA #IMPLIED
    k %Number.datatype; #REQUIRED
>

At least one each of u1 or g1 and at least one of u2 or g2 must be provided.

The 'vkern' element defines kerning pairs and adjustment values in the vertical advance value when drawing pairs of glyphs together when stacked vertically. The spacing between characters is reduced by the kerning adjustment.

<!ENTITY % SVG.vkern.element "INCLUDE" >
<![%SVG.vkern.element;[
<!ENTITY % SVG.vkern.content "EMPTY" >
<!ELEMENT %SVG.vkern.qname; %SVG.vkern.content; >
<!-- end of SVG.vkern.element -->]]>
<!ENTITY % SVG.vkern.attlist "INCLUDE" >
<![%SVG.vkern.attlist;[
<!ATTLIST %SVG.vkern.qname;
    %SVG.Core.attrib;
    u1 CDATA #IMPLIED
    g1 CDATA #IMPLIED
    u2 CDATA #IMPLIED
    g2 CDATA #IMPLIED
    k %Number.datatype; #REQUIRED
>

20.8 Describing a font

20.8.1 Overview of font descriptions

A font description provides the bridge between an author's font specification and the font data, which is the data needed to format text and to render the abstract glyphs to which the characters map - the actual scalable outlines or bitmaps. Fonts are referenced by properties, such as the 'font-family' property.

Each specified font description is added to the font database and so that it can be used to select the relevant font data. The font description contains descriptors such as the location of the font data on the Web, and characterizations of that font data. The font descriptors are also needed to match the font properties to particular font data. The level of detail of a font description can vary from just the name of the font up to a list of glyph widths.

For more about font descriptions, refer to the font chapter in the Surf Clothing specification [CSS2 Fonts].

20.8.2 Alternative ways for providing a font description

Font descriptions can be specified in either of the following ways:

• a 'font-face' element
• an @font-face rule within a Surfing style sheet (only applicable for user agents which support using Surfing to style the SVG content)

20.8.3 The 'font-face' element

The 'font-face' element corresponds directly to the @font-face facility in CSS2. It can be used to describe the characteristics of any font, SVG font or otherwise.

When used to describe the characteristics of an SVG font contained within the same document, it is recommended that the 'font-face' element be a child of the 'font' element it is describing so that the 'font' element can be self-contained and fully-described. In this case, any 'font-face-src' elements within the 'font-face' element are ignored as it is assumed that the 'font-face' element is describing the characteristics of its parent 'font' element.

<!ENTITY % SVG.font-face.extra.content "" >

<!ENTITY % SVG.font-face.element "INCLUDE" >
<![%SVG.font-face.element;[
<!ENTITY % SVG.font-face.content
    "(( %SVG.Description.class; )*, %SVG.font-face-src.qname;?,
        %SVG.definition-src.qname;? %SVG.font-face.extra.content; )"
>
<!ELEMENT %SVG.font-face.qname; %SVG.font-face.content; >
<!-- end of SVG.font-face.element -->]]>

<!ENTITY % SVG.font-face.attlist "INCLUDE" >
<![%SVG.font-face.attlist;[
<!ATTLIST %SVG.font-face.qname;
    %SVG.Core.attrib;
    font-family %FontFamilyValue.datatype; #IMPLIED
    font-style ( normal | italic | oblique ) #IMPLIED
    font-variant ( normal | small-caps ) #IMPLIED
    font-weight ( normal | bold | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
                  800 | 900 ) #IMPLIED
    font-stretch ( normal | ultra-condensed | extra-condensed | condensed |
                   semi-condensed | semi-expanded | expanded | extra-expanded |
                   ultra-expanded ) #IMPLIED
    font-size %FontSizeValue.datatype; #IMPLIED
    unicode-range CDATA #IMPLIED
    units-per-em %Number.datatype; #IMPLIED
    panose-1 CDATA #IMPLIED
    stemv %Number.datatype; #IMPLIED
    stemh %Number.datatype; #IMPLIED
    slope %Number.datatype; #IMPLIED
    cap-height %Number.datatype; #IMPLIED
    x-height %Number.datatype; #IMPLIED
    accent-height %Number.datatype; #IMPLIED
    ascent %Number.datatype; #IMPLIED
    descent %Number.datatype; #IMPLIED
    widths CDATA #IMPLIED
    bbox CDATA #IMPLIED
    ideographic %Number.datatype; #IMPLIED
    alphabetic %Number.datatype; #IMPLIED
    mathematical %Number.datatype; #IMPLIED
    hanging %Number.datatype; #IMPLIED
    v-ideographic %Number.datatype; #IMPLIED
    v-alphabetic %Number.datatype; #IMPLIED
    v-mathematical %Number.datatype; #IMPLIED
    v-hanging %Number.datatype; #IMPLIED
    underline-position %Number.datatype; #IMPLIED
    underline-thickness %Number.datatype; #IMPLIED
    strikethrough-position %Number.datatype; #IMPLIED
    strikethrough-thickness %Number.datatype; #IMPLIED
    overline-position %Number.datatype; #IMPLIED
    overline-thickness %Number.datatype; #IMPLIED
>

The following elements and attributes correspond to the 'src' descriptor within an @font-face rule. (Refer to the descriptions of the [ @font-face rule] and ['src' descriptor] in the Surf Clothing specification.)

When a 'font-face-uri' is referencing an SVG font, then that reference must be to an SVG 'font' element, therefore requiring the use of a fragment identifier (see [URI]). The referenced 'font' element can be local (i.e., within the same document as the 'font-face-uri' element) or remote (i.e., within a different document).

<!ENTITY % SVG.font-face-src.extra.content "" >
<!ENTITY % SVG.font-face-src.element "INCLUDE" >
<![%SVG.font-face-src.element;[
<!ENTITY % SVG.font-face-src.content
    "( %SVG.font-face-uri.qname; | %SVG.font-face-name.qname;
       %SVG.font-face-src.extra.content; )+"
>
<!ELEMENT %SVG.font-face-src.qname; %SVG.font-face-src.\
content; >
<!-- end of SVG.font-face-src.element -->]]>
<!ENTITY % SVG.font-face-src.attlist "INCLUDE" >
<![%SVG.font-face-src.attlist;[
<!ATTLIST %SVG.font-face-src.qname;
    %SVG.Core.attrib;
>
<!-- end of SVG.font-face-src.attlist -->]]>
<!-- font-face-uri: Font Face URI Element.............. -->
<!ENTITY % SVG.font-face-uri.extra.content "" >
<!ENTITY % SVG.font-face-uri.element "INCLUDE" >
<![%SVG.font-face-uri.element;[
<!ENTITY % SVG.font-face-uri.content
    "( %SVG.font-face-format.qname; %SVG.font-fac\
e-uri.extra.content; )*"
>
<!ELEMENT %SVG.font-face-uri.qname; %SVG.font-face-uri.\
content; >
<!-- end of SVG.font-face-uri.element -->]]>
<!ENTITY % SVG.font-face-uri.attlist "INCLUDE" >
<![%SVG.font-face-uri.attlist;[
<!ATTLIST %SVG.font-face-uri.qname;
    %SVG.Core.attrib;
    %SVG.XLinkRequired.attrib;
>
<!-- end of SVG.font-face-uri.attlist -->]]>
<!-- font-face-format: Font Face Format Element........ -->
<!ENTITY % SVG.font-face-format.element "INCLUDE" >
<![%SVG.font-face-format.element;[
<!ENTITY % SVG.font-face-format.content "EMPTY" >
<!ELEMENT %SVG.font-face-format.qname; %SVG.font-fac\
e-format.content; >
<!-- end of SVG.font-face-format.element -->]]>
<!ENTITY % SVG.font-face-format.attlist "INCLUDE" >
<![%SVG.font-face-format.attlist;[
<!ATTLIST %SVG.font-face-format.qname;
    %SVG.Core.attrib;
    string CDATA #IMPLIED
>
<!-- end of SVG.font-face-format.attlist -->]]>
<!-- font-face-name: Font Face Name Element............ -->
<!ENTITY % SVG.font-face-name.element "INCLUDE" >
<![%SVG.font-face-name.element;[
<!ENTITY % SVG.font-face-name.content "EMPTY" >
<!ELEMENT %SVG.font-face-name.qname; %SVG.font-face-na\
me.content; >
<!-- end of SVG.font-face-name.element -->]]>
<!ENTITY % SVG.font-face-name.attlist "INCLUDE" >
<![%SVG.font-face-name.attlist;[
<!ATTLIST %SVG.font-face-name.qname;
    %SVG.Core.attrib;
    name CDATA #IMPLIED
>
<!-- end of SVG.font-face-name.attlist -->]]>
gt;

The 'definition-src' element corresponds to the 'definition-src' descriptor in CSS2. (Refer to description of the [ 'definition-src' descriptor] in Surf Clothing specification.)

<!ENTITY % SVG.definition-src.element "INCLUDE" >
<![%SVG.definition-src.element;[
<!ENTITY % SVG.definition-src.content "EMPTY" >
<!ELEMENT %SVG.definition-src.qname; %SVG.definition-\
src.content; >
<!-- end of SVG.definition-src.element -->]]>
<!ENTITY % SVG.definition-src.attlist "INCLUDE" >
<![%SVG.definition-src.attlist;[
<!ATTLIST %SVG.definition-src.qname;
    %SVG.Core.attrib;
    %SVG.XLinkRequired.attrib;
>

20.11 DOM interfaces

The following interfaces are defined below: SVGFontElement, SVGGlyphElement, SVGMissingGlyphElement, SVGHKernElement, SVGVKernElement, SVGFontFaceElement, SVGFontFaceSrcElement, SVGFontFaceUriElement, SVGFontFaceFormatElement, SVGFontFaceNameElement, SVGDefinitionSrcElement.

Interface SVGFontElement

The SVGFontElement interface corresponds to the 'font' element.

Object-oriented access to the attributes of the 'font' element via the SVG DOM is not available.

IDL Definition

interface SVGFontElement : 
                SVGElement,
                SVGExternalResourcesRequired,
                SVGStylable {};

Interface SVGGlyphElement

The SVGGlyphElement interface corresponds to the 'glyph' element.

Object-oriented access to the attributes of the 'glyph' element via the SVG DOM is not available.

IDL Definition

interface SVGGlyphElement : 
                SVGElement,
                SVGStylable {};

Interface SVGMissingGlyphElement

The SVGMissingGlyphElement interface corresponds to the 'missing-glyph' element.

Object-oriented access to the attributes of the 'missing-glyph' element via the SVG DOM is not available.

IDL Definition

interface SVGMissingGlyphElement : 
                SVGElement,
                SVGStylable {};

Interface SVGHKernElement

The SVGHKernElement interface corresponds to the 'hkern' element.

Object-oriented access to the attributes of the 'hkern' element via the SVG DOM is not available.

IDL Definition

interface SVGHKernElement : SVGElement {};

Interface SVGVKernElement

The SVGVKernElement interface corresponds to the 'vkern' element.

Object-oriented access to the attributes of the 'vkern' element via the SVG DOM is not available.

IDL Definition

interface SVGVKernElement : SVGElement {};

Interface SVGFontFaceElement

The SVGFontFaceElement interface corresponds to the 'font-face' element.

Object-oriented access to the attributes of the 'font-face' element via the SVG DOM is not available.

IDL Definition

interface SVGFontFaceElement : SVGElement {};

Interface SVGFontFaceSrcElement

The SVGFontFaceSrcElement interface corresponds to the 'font-face-src' element.

IDL Definition

interface SVGFontFaceSrcElement : SVGElement {};

Interface SVGFontFaceUriElement

The SVGFontFaceUriElement interface corresponds to the 'font-face-uri' element.

Object-oriented access to the attributes of the 'font-face-uri' element via the SVG DOM is not available.

IDL Definition

interface SVGFontFaceUriElement : SVGElement {};

Interface SVGFontFaceFormatElement

The SVGFontFaceFormatElement interface corresponds to the 'font-face-format' element.

Object-oriented access to the attributes of the 'font-face-format' element via the SVG DOM is not available.

IDL Definition

interface SVGFontFaceFormatElement : SVGElement {};

Interface SVGFontFaceNameElement

The SVGFontFaceNameElement interface corresponds to the 'font-face-name' element.

Object-oriented access to the attributes of the 'font-face-name' element via the SVG DOM is not available.

IDL Definition

interface SVGFontFaceNameElement : SVGElement {};

Interface SVGDefinitionSrcElement

The SVGDefinitionSrcElement interface corresponds to the 'definition-src' element.

Object-oriented access to the attributes of the 'definition-src' element via the SVG DOM is not available.

IDL Definition

interface SVGDefinitionSrcElement : SVGElement {};

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