requiredFeatures

SVG 元素
1. A
2. B-C
3. D
  1. <defs>
  2. <desc>
4. E
  1. <ellipse>
5. F
6. G
7. H
  1. <hkern>
8. I
  1. <image>
9. J-L
  1. <line>
  2. <linearGradient>
10. M
11. N-P
12. Q-R
  1. <radialGradient>
  2. <rect>
13. S
  1. <script>
  2. <set>
  3. <stop>
  4. <style>
  5. <svg>
  6. <switch>
  7. <symbol>
14. T
15. U
  1. <use>
16. V-Z
  1. <view>
  2. <vkern>

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 兼容性表格 at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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.

To detect availability of an SVG feature from script, there is the (also deprecated) DOMImplementation.hasFeature() 方法。

You can use this attribute with the following SVG elements:

范例

html, body, svg {
  height: 100%;
}
text {
  fill: white;
}

<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>

用法注意事项

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

<list-of-features>

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
http://www.w3.org/TR/SVG11/feature#SVGDOM
http://www.w3.org/TR/SVG11/feature#SVG-static
http://www.w3.org/TR/SVG11/feature#SVGDOM-static
http://www.w3.org/TR/SVG11/feature#SVG-animation
http://www.w3.org/TR/SVG11/feature#SVGDOM-animation
http://www.w3.org/TR/SVG11/feature#SVG-dynamic
http://www.w3.org/TR/SVG11/feature#SVGDOM-dynamic
http://www.w3.org/TR/SVG11/feature#CoreAttribute
http://www.w3.org/TR/SVG11/feature#Structure
http://www.w3.org/TR/SVG11/feature#BasicStructure
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#BasicText
http://www.w3.org/TR/SVG11/feature#PaintAttribute
http://www.w3.org/TR/SVG11/feature#BasicPaintAttribute
http://www.w3.org/TR/SVG11/feature#OpacityAttribute
http://www.w3.org/TR/SVG11/feature#GraphicsAttribute
http://www.w3.org/TR/SVG11/feature#BasicGraphicsAttribute
http://www.w3.org/TR/SVG11/feature#Marker
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#BasicClip
http://www.w3.org/TR/SVG11/feature#Mask
http://www.w3.org/TR/SVG11/feature#Filter
http://www.w3.org/TR/SVG11/feature#BasicFilter
http://www.w3.org/TR/SVG11/feature#DocumentEventsAttribute
http://www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute
http://www.w3.org/TR/SVG11/feature#AnimationEventsAttribute
http://www.w3.org/TR/SVG11/feature#Cursor
http://www.w3.org/TR/SVG11/feature#Hyperlinking
http://www.w3.org/TR/SVG11/feature#XlinkAttribute
http://www.w3.org/TR/SVG11/feature#View
http://www.w3.org/TR/SVG11/feature#Script
http://www.w3.org/TR/SVG11/feature#Animation
http://www.w3.org/TR/SVG11/feature#Font
http://www.w3.org/TR/SVG11/feature#BasicFont
http://www.w3.org/TR/SVG11/feature#Extensibility

范例

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;
}

结果

另请参阅 requiredFeatures.svg

规范

规范	状态	注释
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'requiredFeatures' in that specification.	推荐	初始定义

浏览器兼容性

BCD tables only load in the browser

另请参阅

DOMImplementation.hasFeature()

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最后修改： Jan 25, 2022 , 由 MDN 贡献者