The contents of the ‘marker’ are relative to a new coordinate system. Attribute ‘markerUnits’ determines an initial scale factor for transforming the graphics in the marker into the user coordinate system for the referencing element. An additional set of transformations might occur if there is a ‘viewBox’ attribute, in which case the coordinate system for the contents of the ‘marker’ will be transformed due to the processing of attributes ‘viewBox’ and ‘preserveAspectRatio’. If there is no ‘viewBox’ attribute, then the assumed default value for the the ‘viewBox’ attribute has the origin of the viewBox coincident with the origin of the viewport and the width/height of the viewBox the same as the width/height of the viewport.

The ‘fill-rule’ property indicates the algorithm which is to be used to determine what parts of the canvas are included inside the shape. For a simple, non-intersecting path, it is intuitively clear what region lies "inside"; however, for a more complex path, such as a path that intersects itself or where one subpath encloses another, the interpretation of "inside" is not so obvious.

When a child element is blended into a background, the value of the ‘color-interpolation’ property on the child determines the type of blending, not the value of the ‘color-interpolation’ on the parent. For gradients which make use of the ‘xlink:href’ attribute to reference another gradient, the gradient uses the ‘color-interpolation’ property value from the gradient element which is directly referenced by the ‘fill’ or ‘stroke’ property. When animating colors, color interpolation is performed according to the value of the ‘color-interpolation’ property on the element being animated.

Winding roadmeaning

When stroking is performed using a complex paint server, such as a gradient or a pattern, the stroke operation must be identical to the result that would have occurred if the geometric shape defined by the geometry of the current graphics element and its associated stroking properties were converted to an equivalent ‘path’ element and then filled using the given paint server.

For user agents that support Styling with CSS, the conceptual deep cloning of the referenced ‘marker’ element into a non-exposed DOM tree also copies any property values resulting from the CSS cascade ([CSS2], chapter 6) and property inheritance on the referenced element and its contents. CSS2 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.

For example, a miter limit of 1.414 converts miters to bevels for theta less than 90 degrees, a limit of 4.0 converts them for theta less than approximately 29 degrees, and a limit of 10.0 converts them for theta less than approximately 11.5 degrees.

ConcealedRoad sign

A list of comma and/or white space separated s (which can have a unit identifier) and s. A percentage represents a distance as a percentage of the current viewport (see Units). A negative value is an error (see Error processing). If the sum of the values is zero, then the stroke is rendered as if a value of none were specified. For further details see the path implementation notes.

‘stroke-linecap’ specifies the shape to be used at the end of open subpaths when they are stroked. For further details see the path implementation notes.

Sideroad sign

Note that if the ‘visibility’ property is set to hidden on a ‘tspan’, ‘tref’ or ‘altGlyph’ element, then the text is invisible but still takes up space in text layout calculations.

SVG uses two properties, ‘display’ and ‘visibility’, to control the visibility of graphical elements or (in the case of the ‘display’ property) container elements.

The ‘marker’ element defines the graphics that is to be used for drawing arrowheads or polymarkers on a given ‘path’, ‘line’, ‘polyline’ or ‘polygon’ element.

Event attributes and event listeners attached to the contents of a ‘marker’ element are not processed; only the rendering aspects of ‘marker’ elements are processed.

The creator of SVG content might want to provide a hint to the implementation about how to make speed vs. quality tradeoffs as it performs image processing. The ‘image-rendering’ property provides a hint to the SVG user agent about how to optimize its image rendering.

Markers are drawn such that their reference point (i.e., attributes ‘refX’ and ‘refY’) is positioned at the given vertex. In other words, a translation transformation is constructed by the user agent to achieve the effect of having point (‘refX’ and ‘refY’) within the marker content's coordinate system (after any transformations due to the ‘viewBox’ and ‘preserveAspectRatio’ attributes) align exactly with the given vertex.

Elements with display: none do not take up space in text layout operations, do not receive events, and do not contribute to bounding box and clipping paths calculations.

This property specifies the width of the stroke on the current object. If a is used, the value represents a percentage of the current viewport. (See Units.)

The ‘display’ property only affects the direct rendering of a given element, whereas it does not prevent elements from being referenced by other elements. For example, setting display: none on a ‘path’ element will prevent that element from getting rendered directly onto the canvas, but the ‘path’ element can still be referenced by a ‘textPath’ element; furthermore, its geometry will be used in text-on-a-path processing even if the ‘path’ has display: none.

Winding roads may be fun to drive but they can be dangerous too. Notify drivers of the upcoming curves with a large bright yellow aluminium winding road sign.

Properties inherit into the ‘marker’ element from its ancestors; properties do not inherit from the element referencing the ‘marker’ element.

‘stroke-dasharray’ controls the pattern of dashes and gaps used to stroke paths. contains a list of comma and/or white space separated s and s that specify the lengths of alternating dashes and gaps. If an odd number of values is provided, then the list of values is repeated to yield an even number of values. Thus, stroke-dasharray: 5,3,2 is equivalent to stroke-dasharray: 5,3,2,5,3,2.

‘marker’ elements are never rendered directly; their only usage is as something that can be referenced using the ‘marker’, ‘marker-start’, ‘marker-end’ and ‘marker-mid’ properties. The ‘display’ property does not apply to the ‘marker’ element; thus, ‘marker’ elements are not directly rendered even if the ‘display’ property is set to a value other than none, and ‘marker’ elements are available for referencing even when the ‘display’ property on the ‘marker’ element or any of its ancestors is set to none.

The ‘fill’ property paints the interior of the given graphical element. The area to be painted consists of any areas inside the outline of the shape. To determine the inside of the shape, all subpaths are considered, and the interior is determined according to the rules associated with the current value of the ‘fill-rule’ property. The zero-width geometric outline of a shape is included in the area to be painted.

Slipperyroad sign

The ‘marker’ property specifies the marker symbol that shall be used for all points on the sets the value for all vertices on the given ‘path’ element or basic shape. It is a short-hand for the three individual marker properties:

In all cases, all stroking properties which are affected by directionality, such as those having to do with dash patterns, must be rendered such that the stroke operation starts at the same point at which the graphics element starts. In particular, for ‘path’ elements, the start of the path is the first point of the initial "moveto" command.

In all cases, resampling must be done in a truecolor (e.g., 24-bit) color space even if the original data and/or the target device is indexed color.

‘stroke-linejoin’ specifies the shape to be used at the corners of paths or basic shapes when they are stroked. For further details see the path implementation notes.

Slippery When Wetroad sign

SVG uses the general notion of a paint server. Paint servers are specified using a IRI reference on a ‘fill’ or ‘stroke’ property. Gradients and patterns are just specific types of paint servers.

Winding road signvs slipperyroad

Out-of-range color values, if supported by the user agent, also are converted using the above formulas. (See Clamping values which are restricted to a particular range.)

For stroking properties such as dash patterns whose computations are dependent on progress along the outline of the graphics element, distance calculations are required to utilize the SVG user agent's standard Distance along a path algorithms.

Standard: 01 If Table 2C-5 indicates that a horizontal alignment sign is required, recommended, or allowed, the sign installed in advance of the curve shall be a Curve (W1-2) sign unless a different sign is recommended or allowed by the provisions of this Section.

When two line segments meet at a sharp angle and miter joins have been specified for ‘stroke-linejoin’, it is possible for the miter to extend far beyond the thickness of the line stroking the path. The ‘stroke-miterlimit’ imposes a limit on the ratio of the miter length to the ‘stroke-width’. When the limit is exceeded, the join is converted from a miter to a bevel.

The ratio of miter length (distance between the outer tip and the inner corner of the miter) to ‘stroke-width’ is directly related to the angle (theta) between the segments in user space by the formula:

The creator of SVG content might want to provide a hint to the implementation about what tradeoffs to make as it renders vector graphics elements such as ‘path’ elements and basic shapes such as circles and rectangles. The ‘shape-rendering’ property provides these hints.

Winding roads may be fun to drive but they can be dangerous too. Notify drivers of the upcoming curves with a large bright yellow aluminium winding road sign.

The conversion formulas between the sRGB color space (i.e., nonlinear with 2.2 gamma curve) and the linearized RGB color space (i.e., color values expressed as sRGB tristimulus values without a gamma curve) can be found in the sRGB specification [SRGB]. For illustrative purposes, the following formula shows the conversion from sRGB to linearized RGB:

SVG's user agent style sheet sets the ‘overflow’ property for ‘marker’ elements to hidden, which causes a rectangular clipping path to be created at the bounds of the marker tile. Unless the ‘overflow’ property is overridden, any graphics within the marker which goes outside of the marker rectangle will be clipped.

Both properties choose between color operations occurring in the sRGB color space or in a (light energy linear) linearized RGB color space. Having chosen the appropriate color space, component-wise linear interpolation is used.

The rendering effect of a marker is as if the contents of the referenced ‘marker’ element were deeply cloned into a separate non-exposed DOM tree for each instance of the marker. Because the cloned DOM tree is non-exposed, the SVG DOM does not show the cloned instance of the marker.

‘marker-start’ defines the arrowhead or polymarker that shall be drawn at the first vertex of the given ‘path’ element or basic shape. ‘marker-end’ defines the arrowhead or polymarker that shall be drawn at the final vertex. ‘marker-mid’ defines the arrowhead or polymarker that shall be drawn at every other vertex (i.e., every vertex except the first and last). Note that for a ‘path’ element which ends with a closed sub-path, the last vertex is the same as the initial vertex on the given sub-path. In this case, if ‘marker-end’ does not equal none, then it is possible that two markers will be rendered on the given vertex. One way to prevent this is to set ‘marker-end’ to none. (Note that the same comment applies to ‘polygon’ elements.)

Note that ‘color-interpolation-filters’ has a different initial value than ‘color-interpolation’. ‘color-interpolation-filters’ has an initial value of linearRGB, whereas ‘color-interpolation’ has an initial value of sRGB. Thus, in the default case, filter effects operations occur in the linearRGB color space, whereas all other color interpolations occur by default in the sRGB color space.

(Note: the above explanations do not specify what to do if a path segment coincides with or is tangent to the ray. Since any ray will do, one may simply choose a different ray that does not have such problem intersections.)

The values of any of the painting properties described in this chapter can be inherited from a given object's parent. Painting, however, is always done on each graphics element individually, never at the container element (e.g., a ‘g’) level. Thus, for the following SVG, even though the gradient fill is specified on the ‘g’, the gradient is simply inherited through the ‘g’ element down into each rectangle, each of which is rendered such that its interior is painted with the gradient.

The creator of SVG content might want to provide a hint to the implementation about how to make speed vs. quality tradeoffs as it performs color interpolation and compositing. The ‘color-rendering’ property provides a hint to the SVG user agent about how to optimize its color interpolation and compositing operations.

A marker is a symbol which is attached to one or more vertices of ‘path’, ‘line’, ‘polyline’ and ‘polygon’ elements. Typically, markers are used to make arrowheads or polymarkers. Arrowheads can be defined by attaching a marker to the start or end vertices of ‘path’, ‘line’ or ‘polyline’ elements. Polymarkers can be defined by attaching a marker to all vertices of a ‘path’, ‘line’, ‘polyline’ or ‘polygon’ element.

The SVG user agent performs color interpolations and compositing at various points as it processes SVG content. Two properties, ‘color-interpolation’ and ‘color-interpolation-filters’, control which color space is used for particular categories of graphics operations. The following table shows which property applies to which graphics operations:

Curvyroad sign

‘path’ elements, ‘text’ elements and basic shapes can be filled (which means painting the interior of the object) and stroked (which means painting along the outline of the object). Filling and stroking both can be thought of in more general terms as painting operations.

‘fill-opacity’ specifies the opacity of the painting operation used to paint the interior the current object. (See Painting shapes and text.)

Depending on the value of property ‘pointer-events’, graphics elements which have their ‘visibility’ property set to hidden still might receive events.

The ‘color-interpolation’ property specifies the color space for gradient interpolations, color animations and alpha compositing.

The graphics for a marker are defined by a ‘marker’ element. To indicate that a particular ‘marker’ element should be rendered at the vertices of a particular ‘path’, ‘line’, ‘polyline’ or ‘polygon’ element, set one or more marker properties (‘marker’, ‘marker-start’, ‘marker-mid’ or ‘marker-end’) to reference the given ‘marker’ element.

Winding Road signmeaning

Except for any additional information provided in this specification, the normative definition of the ‘visibility’ property is the CSS2 definition ([CSS2], section 11.2).

‘color-rendering’ takes precedence over ‘color-interpolation-filters’. For example, assume color-rendering: optimizeSpeed and color-interpolation-filters: linearRGB. In this case, the SVG user agent should perform color operations in a way that optimizes performance, which might mean sacrificing the color interpolation precision as specified by color-interpolation-filters: linearRGB.

A value of display: none indicates that the given element and its children shall not be rendered directly (i.e., those elements are not present in the rendering tree). Any value other than none or inherit indicates that the given element shall be rendered by the SVG user agent.

‘stroke-opacity’ specifies the opacity of the painting operation used to stroke the current object. (See Painting shapes and text.)

Except for any additional information provided in this specification, the normative definition of the ‘display’ property is the CSS2 definition ([CSS2], section 9.2.6).

Certain elements (i.e., ‘path’, ‘polyline’, ‘polygon’ and ‘line’ elements) can also have marker symbols drawn at their vertices.

Any painting properties defined in terms of the object's bounding box use the bounding box of the graphics element to which the operation applies. Note that text elements are defined such that any painting operations defined in terms of the object's bounding box use the bounding box of the entire ‘text’ element. (See the discussion of object bounding box units and text elements.)

The fill operation fills open subpaths by performing the fill operation as if an additional "closepath" command were added to the path to connect the last point of the subpath with the first point of the subpath. Thus, fill operations apply to both open subpaths within ‘path’ elements (i.e., subpaths without a closepath command) and ‘polyline’ elements.

The creator of SVG content might want to provide a hint to the implementation about what tradeoffs to make as it renders text. The ‘text-rendering’ property provides these hints.

The ‘display’ property affects direct rendering into offscreen canvases also, such as occurs with the implementation model for masks. Thus, setting display: none on a child of a ‘mask’ will prevent the given child element from being rendered as part of the mask. Similarly, setting display: none on a child of a ‘clipPath’ element will prevent the given child element from contributing to the clipping path.

A subpath (see Paths) consisting of a single moveto shall not be stroked. Any zero length subpath shall not be stroked if the ‘stroke-linecap’ property has a value of butt but shall be stroked if the ‘stroke-linecap’ property has a value of round or square, producing respectively a circle or a square centered at the given point. Examples of zero length subpaths include 'M 10,10 L 10,10', 'M 20,20 h 0', 'M 30,30 z' and 'M 40,40 c 0,0 0,0 0,0'.

For each marker that is drawn, a temporary new user coordinate system is established so that the marker will be positioned and sized correctly, as follows: