W3cubDocs

/SVG

requiredFeatures

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The requiredFeatures attribute takes a list of feature strings, with the individual strings separated by white space. It determines whether or not all of the named features are supported by the browser; if all of them are supported, the attribute evaluates to true end the element is rendered; otherwise, the attribute evaluates to false and the current element and its children are skipped and thus will not be rendered. This provides a way to design SVG that gracefully falls back when features aren't available.

If the attribute is not present, then its implicit evaluated value is true. If a null string or empty string value is given to attribute requiredFeatures, the attribute is evaluate to false.

requiredFeatures is often used in conjunction with the <switch> element. If requiredFeatures is used in other situations, it represents a simple switch on the given element whether to render the element or not.

You can use this attribute with the following SVG elements:

Example

<svg viewBox="0 0 250 45" xmlns="http://www.w3.org/2000/svg">
  <g>
    <rect fill="forestgreen" x="10" y="10" height="25" width="230" />
    <text x="20" y="27">requiredFeatures supported</text>
  </g>
  <g requiredFeatures="">
    <rect fill="crimson" x="10" y="10" height="25" width="230" />
    <text x="20" y="27">requiredFeatures not supported</text>
  </g>
</svg>

Usage notes

Value	`<list-of-features>`
Default value	`true` if not defined, `false` if null or empty string as value
Animatable	No

<list-of-features>: This is a list of feature strings, separated using white space. Determines whether all of the named features are supported by the browser. See Feature strings below for a list of allowed values.

Feature strings

The following are the feature strings for the requiredFeatures attribute. These same feature strings apply to the hasFeature method call that is part of the SVG DOM's support for the DOMImplementation interface. In some cases the feature strings map directly to a set of attributes, properties or elements, in others they represent some functionality of the browser. Note that the format and naming for feature strings changed from SVG 1.0 to SVG 1.1. The SVG 1.0 feature strings are not listed here but can be found in the SVG Specification. Some browser support SVG 1.0 Feature strings for compatibility reasons. However, the SVG 1.0 feature strings are considered deprecated.

http://www.w3.org/TR/SVG11/feature#SVG

At least one of the following feature is supported:

http://www.w3.org/TR/SVG11/feature#SVG-static
http://www.w3.org/TR/SVG11/feature#SVG-animation
http://www.w3.org/TR/SVG11/feature#SVG-dynamic
http://www.w3.org/TR/SVG11/feature#SVGDOM

http://www.w3.org/TR/SVG11/feature#SVGDOM

At least one of the following feature is supported:

http://www.w3.org/TR/SVG11/feature#SVGDOM-static
http://www.w3.org/TR/SVG11/feature#SVGDOM-animation
http://www.w3.org/TR/SVG11/feature#SVGDOM-dynamic

http://www.w3.org/TR/SVG11/feature#SVG-static

The browser supports all the following features:

http://www.w3.org/TR/SVG11/feature#CoreAttribute
http://www.w3.org/TR/SVG11/feature#Structure
http://www.w3.org/TR/SVG11/feature#ContainerAttribute
http://www.w3.org/TR/SVG11/feature#ConditionalProcessing
http://www.w3.org/TR/SVG11/feature#Image
http://www.w3.org/TR/SVG11/feature#Style
http://www.w3.org/TR/SVG11/feature#ViewportAttribute
http://www.w3.org/TR/SVG11/feature#Shape
http://www.w3.org/TR/SVG11/feature#Text
http://www.w3.org/TR/SVG11/feature#PaintAttribute
http://www.w3.org/TR/SVG11/feature#OpacityAttribute
http://www.w3.org/TR/SVG11/feature#GraphicsAttribute
http://www.w3.org/TR/SVG11/feature#Marker
http://www.w3.org/TR/SVG11/feature#ColorProfile
http://www.w3.org/TR/SVG11/feature#Gradient
http://www.w3.org/TR/SVG11/feature#Pattern
http://www.w3.org/TR/SVG11/feature#Clip
http://www.w3.org/TR/SVG11/feature#Mask
http://www.w3.org/TR/SVG11/feature#Filter
http://www.w3.org/TR/SVG11/feature#XlinkAttribute
http://www.w3.org/TR/SVG11/feature#Font
http://www.w3.org/TR/SVG11/feature#Extensibility

http://www.w3.org/TR/SVG11/feature#SVGDOM-static

The browser supports all DOM interfaces and methods to the language features for http://www.w3.org/TR/SVG11/feature#SVG-static.

http://www.w3.org/TR/SVG11/feature#SVG-animation

The browser supports all of the language features from http://www.w3.org/TR/SVG11/feature#SVG-static plus the feature http://www.w3.org/TR/SVG11/feature#Animation.

http://www.w3.org/TR/SVG11/feature#SVGDOM-animation

The browser supports all DOM interfaces and methods corresponding to the language features for http://www.w3.org/TR/SVG11/feature#SVG-animation.

http://www.w3.org/TR/SVG11/feature#SVG-dynamic

The browser supports all of the language features from http://www.w3.org/TR/SVG11/feature#SVG-animation plus the following features:

http://www.w3.org/TR/SVG11/feature#Hyperlinking
http://www.w3.org/TR/SVG11/feature#Scripting
http://www.w3.org/TR/SVG11/feature#View
http://www.w3.org/TR/SVG11/feature#Cursor
http://www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute
http://www.w3.org/TR/SVG11/feature#DocumentEventsAttribute
http://www.w3.org/TR/SVG11/feature#AnimationEventsAttribute

http://www.w3.org/TR/SVG11/feature#SVGDOM-dynamic

The browser supports all DOM interfaces and methods to the language features for http://www.w3.org/TR/SVG11/feature#SVG-dynamic.

http://www.w3.org/TR/SVG11/feature#CoreAttribute

The browser supports the id, xml:base, xml:lang and xml:space attributes

http://www.w3.org/TR/SVG11/feature#Structure

The browser supports <svg>, <g>, <defs>, <desc>, <title>, <metadata>, <symbol> and <use> elements.

http://www.w3.org/TR/SVG11/feature#BasicStructure

The browser supports <svg>, <g>, <defs>, <desc>, <title>, <metadata> and <use> elements.

http://www.w3.org/TR/SVG11/feature#ContainerAttribute

The browser supports the enable-background attribute

http://www.w3.org/TR/SVG11/feature#ConditionalProcessing

The browser supports the <switch> element, and the requiredFeatures, requiredExtensions, systemLanguage attributes

http://www.w3.org/TR/SVG11/feature#Image

The browser supports the <image> element.

http://www.w3.org/TR/SVG11/feature#Style

The browser supports the <style> element.

http://www.w3.org/TR/SVG11/feature#ViewportAttribute

The browser supports the clip and overflow attributes.

http://www.w3.org/TR/SVG11/feature#Shape

The browser supports the <rect>, <circle>, <line>, <polyline>, <polygon>, <ellipse> and <path> elements.

http://www.w3.org/TR/SVG11/feature#Text

The browser supports the <text>, <tspan>, <tref>, <textPath>, <altGlyph>, <altGlyphDef>, <altGlyphItem> and <glyphRef> elements.

http://www.w3.org/TR/SVG11/feature#BasicText

The browser supports the <text> element

http://www.w3.org/TR/SVG11/feature#PaintAttribute

The browser supports the color, fill, fill-rule, stroke, stroke-dasharray, stroke-dashoffset, stroke-linecap, stroke-linejoin, stroke-miterlimit, stroke-width, color-interpolation and color-rendering attributes

http://www.w3.org/TR/SVG11/feature#BasicPaintAttribute

http://www.w3.org/TR/SVG11/feature#OpacityAttribute

The browser supports the opacity, stroke-opacity and fill-opacity attributes

http://www.w3.org/TR/SVG11/feature#GraphicsAttribute

The browser supports the display, image-rendering, pointer-events, shape-rendering, text-rendering and visibility attributes

http://www.w3.org/TR/SVG11/feature#BasicGraphicsAttribute

The browser supports the display and visibility attributes

http://www.w3.org/TR/SVG11/feature#Marker

The browser supports the <marker> element

http://www.w3.org/TR/SVG11/feature#Gradient

The browser supports the <linearGradient>, <radialGradient> and <stop> elements

http://www.w3.org/TR/SVG11/feature#Pattern

The browser supports the <pattern> element

http://www.w3.org/TR/SVG11/feature#Clip

The browser supports the <clipPath> element and the clip-path, clip-rule attributes

http://www.w3.org/TR/SVG11/feature#BasicClip

The browser supports the <clipPath> element and the clip-path attribute

http://www.w3.org/TR/SVG11/feature#Mask

The browser supports the <mask> element

http://www.w3.org/TR/SVG11/feature#Filter

The browser supports the <filter>, <feBlend>, <feColorMatrix>, <feComponentTransfer>, <feComposite>, <feConvolveMatrix>, <feDiffuseLighting>, <feDisplacementMap>, <feFlood>, <feGaussianBlur>, <feImage>, <feMerge>, <feMergeNode>, <feMorphology>, <feOffset>, <feSpecularLighting>, <feTile>, <feDistantLight>, <fePointLight>, <feSpotLight>, <feFuncR>, <feFuncG>, <feFuncB> and <feFuncA> elements

http://www.w3.org/TR/SVG11/feature#BasicFilter

The browser supports the <filter>, <feBlend>, <feColorMatrix>, <feComponentTransfer>, <feComposite>, <feFlood>, <feGaussianBlur>, <feImage>, <feMerge>, <feMergeNode>, <feOffset>, <feTile>, <feFuncR>, <feFuncG>, <feFuncB> and <feFuncA> elements

http://www.w3.org/TR/SVG11/feature#DocumentEventsAttribute

The browser supports the onunload, onabort, onerror, onresize, onscroll and onzoom attributes

http://www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute

The browser supports the onfocusin, onfocusout, onactivate, onclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout and onload attributes

http://www.w3.org/TR/SVG11/feature#AnimationEventsAttribute

The browser supports the onbegin, onend, onrepeat and onload attributes

http://www.w3.org/TR/SVG11/feature#Cursor

The browser supports the <cursor> element

http://www.w3.org/TR/SVG11/feature#Hyperlinking

The browser supports the <a> element

http://www.w3.org/TR/SVG11/feature#XlinkAttribute

The browser supports the xlink:type, xlink:href, xlink:role, xlink:arcrole, xlink:title, xlink:show and xlink:actuate attributes

http://www.w3.org/TR/SVG11/feature#View

The browser supports the <view> element

http://www.w3.org/TR/SVG11/feature#Script

The browser supports the <script> element

http://www.w3.org/TR/SVG11/feature#Animation

The browser supports the <animate>, <set>, <animateMotion>, <animateTransform>, and <mpath> elements

http://www.w3.org/TR/SVG11/feature#Font

The browser supports the <font>, <font-face>, <glyph>, <missing-glyph>, <hkern>, <vkern>, <font-face-src>, <font-face-uri>, <font-face-format> and <font-face-name> elements

http://www.w3.org/TR/SVG11/feature#BasicFont

The browser supports the <font>, <font-face>, <glyph>, <missing-glyph>, <hkern>, <font-face-src> and <font-face-name> elements

http://www.w3.org/TR/SVG11/feature#Extensibility

The browser supports the <foreignObject> element

Testing feature support

SVG

<svg width="450" height="1170" xmlns="http://www.w3.org/2000/svg">
  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVG -->
  <rect class="ko" x="10" y="10" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="10"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVG" />
  <text x="20" y="27">http://www.w3.org/TR/SVG11/feature#SVG</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVGDOM -->
  <rect class="ko" x="10" y="35" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="35"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVGDOM" />
  <text x="20" y="52">http://www.w3.org/TR/SVG11/feature#SVGDOM</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVG-static -->
  <rect class="ko" x="10" y="60" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="60"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVG-static" />
  <text x="20" y="77">http://www.w3.org/TR/SVG11/feature#SVG-static</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVGDOM-static -->
  <rect class="ko" x="10" y="85" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="85"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVGDOM-static" />
  <text x="20" y="102">http://www.w3.org/TR/SVG11/feature#SVGDOM-static</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVG-animation -->
  <rect class="ko" x="10" y="110" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="110"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVG-animation" />
  <text x="20" y="127">http://www.w3.org/TR/SVG11/feature#SVG-animation</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVGDOM-animation -->
  <rect class="ko" x="10" y="135" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="135"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVGDOM-animation" />
  <text x="20" y="152">
    http://www.w3.org/TR/SVG11/feature#SVGDOM-animation
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVG-dynamic -->
  <rect class="ko" x="10" y="160" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="160"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVG-dynamic" />
  <text x="20" y="177">http://www.w3.org/TR/SVG11/feature#SVG-dynamic</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#SVGDOM-dynamic -->
  <rect class="ko" x="10" y="185" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="185"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#SVGDOM-dynamic" />
  <text x="20" y="202">http://www.w3.org/TR/SVG11/feature#SVGDOM-dynamic</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#CoreAttribute -->
  <rect class="ko" x="10" y="210" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="210"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#CoreAttribute" />
  <text x="20" y="227">http://www.w3.org/TR/SVG11/feature#CoreAttribute</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Structure -->
  <rect class="ko" x="10" y="235" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="235"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Structure" />
  <text x="20" y="252">http://www.w3.org/TR/SVG11/feature#Structure</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicStructure -->
  <rect class="ko" x="10" y="260" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="260"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicStructure" />
  <text x="20" y="277">http://www.w3.org/TR/SVG11/feature#BasicStructure</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#ContainerAttribute -->
  <rect class="ko" x="10" y="285" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="285"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#ContainerAttribute" />
  <text x="20" y="302">
    http://www.w3.org/TR/SVG11/feature#ContainerAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#ConditionalProcessing -->
  <rect class="ko" x="10" y="310" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="310"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#ConditionalProcessing" />
  <text x="20" y="327">
    http://www.w3.org/TR/SVG11/feature#ConditionalProcessing
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Image -->
  <rect class="ko" x="10" y="335" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="335"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Image" />
  <text x="20" y="352">http://www.w3.org/TR/SVG11/feature#Image</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Style -->
  <rect class="ko" x="10" y="360" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="360"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Style" />
  <text x="20" y="377">http://www.w3.org/TR/SVG11/feature#Style</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#ViewportAttribute -->
  <rect class="ko" x="10" y="385" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="385"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#ViewportAttribute" />
  <text x="20" y="402">
    http://www.w3.org/TR/SVG11/feature#ViewportAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Shape -->
  <rect class="ko" x="10" y="410" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="410"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Shape" />
  <text x="20" y="427">http://www.w3.org/TR/SVG11/feature#Shape</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Text -->
  <rect class="ko" x="10" y="435" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="435"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Text" />
  <text x="20" y="452">http://www.w3.org/TR/SVG11/feature#Text</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicText -->
  <rect class="ko" x="10" y="460" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="460"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicText" />
  <text x="20" y="477">http://www.w3.org/TR/SVG11/feature#BasicText</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#PaintAttribute -->
  <rect class="ko" x="10" y="485" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="485"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#PaintAttribute" />
  <text x="20" y="502">http://www.w3.org/TR/SVG11/feature#PaintAttribute</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicPaintAttribute -->
  <rect class="ko" x="10" y="510" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="510"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicPaintAttribute" />
  <text x="20" y="527">
    http://www.w3.org/TR/SVG11/feature#BasicPaintAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#OpacityAttribute -->
  <rect class="ko" x="10" y="535" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="535"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#OpacityAttribute" />
  <text x="20" y="552">
    http://www.w3.org/TR/SVG11/feature#OpacityAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#GraphicsAttribute -->
  <rect class="ko" x="10" y="560" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="560"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#GraphicsAttribute" />
  <text x="20" y="577">
    http://www.w3.org/TR/SVG11/feature#GraphicsAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicGraphicsAttribute -->
  <rect class="ko" x="10" y="585" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="585"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicGraphicsAttribute" />
  <text x="20" y="602">
    http://www.w3.org/TR/SVG11/feature#BasicGraphicsAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Marker -->
  <rect class="ko" x="10" y="610" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="610"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Marker" />
  <text x="20" y="627">http://www.w3.org/TR/SVG11/feature#Marker</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#ColorProfile -->
  <rect class="ko" x="10" y="635" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="635"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#ColorProfile" />
  <text x="20" y="652">http://www.w3.org/TR/SVG11/feature#ColorProfile</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Gradient -->
  <rect class="ko" x="10" y="660" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="660"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Gradient" />
  <text x="20" y="677">http://www.w3.org/TR/SVG11/feature#Gradient</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Pattern -->
  <rect class="ko" x="10" y="685" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="685"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Pattern" />
  <text x="20" y="702">http://www.w3.org/TR/SVG11/feature#Pattern</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Clip -->
  <rect class="ko" x="10" y="710" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="710"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Clip" />
  <text x="20" y="727">http://www.w3.org/TR/SVG11/feature#Clip</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicClip -->
  <rect class="ko" x="10" y="735" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="735"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicClip" />
  <text x="20" y="752">http://www.w3.org/TR/SVG11/feature#BasicClip</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Mask -->
  <rect class="ko" x="10" y="760" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="760"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Mask" />
  <text x="20" y="777">http://www.w3.org/TR/SVG11/feature#Mask</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Filter -->
  <rect class="ko" x="10" y="785" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="785"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Filter" />
  <text x="20" y="802">http://www.w3.org/TR/SVG11/feature#Filter</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicFilter -->
  <rect class="ko" x="10" y="810" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="810"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicFilter" />
  <text x="20" y="827">http://www.w3.org/TR/SVG11/feature#BasicFilter</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#DocumentEventsAttribute -->
  <rect class="ko" x="10" y="835" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="835"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#DocumentEventsAttribute" />
  <text x="20" y="852">
    http://www.w3.org/TR/SVG11/feature#DocumentEventsAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute -->
  <rect class="ko" x="10" y="860" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="860"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute" />
  <text x="20" y="877">
    http://www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#AnimationEventsAttribute -->
  <rect class="ko" x="10" y="885" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="885"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#AnimationEventsAttribute" />
  <text x="20" y="902">
    http://www.w3.org/TR/SVG11/feature#AnimationEventsAttribute
  </text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Cursor -->
  <rect class="ko" x="10" y="910" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="910"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Cursor" />
  <text x="20" y="927">http://www.w3.org/TR/SVG11/feature#Cursor</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Hyperlinking -->
  <rect class="ko" x="10" y="935" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="935"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Hyperlinking" />
  <text x="20" y="952">http://www.w3.org/TR/SVG11/feature#Hyperlinking</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#XlinkAttribute -->
  <rect class="ko" x="10" y="960" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="960"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#XlinkAttribute" />
  <text x="20" y="977">http://www.w3.org/TR/SVG11/feature#XlinkAttribute</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#View -->
  <rect class="ko" x="10" y="1010" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="1010"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#View" />
  <text x="20" y="1027">http://www.w3.org/TR/SVG11/feature#View</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Script -->
  <rect class="ko" x="10" y="1035" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="1035"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Script" />
  <text x="20" y="1052">http://www.w3.org/TR/SVG11/feature#Script</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Animation -->
  <rect class="ko" x="10" y="1060" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="1060"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Animation" />
  <text x="20" y="1077">http://www.w3.org/TR/SVG11/feature#Animation</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Font -->
  <rect class="ko" x="10" y="1085" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="1085"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Font" />
  <text x="20" y="1102">http://www.w3.org/TR/SVG11/feature#Font</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#BasicFont -->
  <rect class="ko" x="10" y="1110" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="1110"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#BasicFont" />
  <text x="20" y="1127">http://www.w3.org/TR/SVG11/feature#BasicFont</text>

  <!-- Testing : http://www.w3.org/TR/SVG11/feature#Extensibility -->
  <rect class="ko" x="10" y="1135" height="25" width="430" />
  <rect
    class="ok"
    x="10"
    y="1135"
    height="25"
    width="430"
    requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" />
  <text x="20" y="1152">http://www.w3.org/TR/SVG11/feature#Extensibility</text>
</svg>

CSS

.ko {
  fill: #900;
}

.ok {
  fill: #060;
}

rect {
  stroke: #000;
  stroke-width: 2px;
}

text {
  fill: #fff;
  font: 12px sans-serif;
}

Result

Specifications

Specification
Scalable Vector Graphics (SVG) 1.1 (Second Edition) # RequiredFeaturesAttribute

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`requiredFeatures`	No	No	No	No	No	No	No	No	No	No	No	No

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/requiredFeatures