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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Note: This feature is available since Firefox 55, but is only currently supported with SVG images loaded via chrome:// or resource:// URLs. To experiment with the feature in SVG on the Web it is necessary to set the svg.context-properties.content.enabled pref to true.

If you reference an SVG image in a webpage (such as with the <img> element or as a background image), the SVG image can coordinate with the embedding element (its context) to have the image adopt property values set on the embedding element. To do this the embedding element needs to list the properties that are to be made available to the image by listing them as values of the -moz-context-properties property, and the image needs to opt in to using those properties by using values such as the context-fill value.

Initial valuenone
Applies toAny element that can have an image applied to it, for example as a background-image, border-image, or list-style-image.
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* Keyword values */
-moz-context-properties: fill;
-moz-context-properties: fill, stroke;

/* Global values */
-moz-context-properties: inherit;
-moz-context-properties: initial;
-moz-context-properties: unset;


Expose the fill value set on the image to the embedded SVG.
Expose the stroke value set on the image to the embedded SVG.
Expose the fill-opacity value set on the image to the embedded SVG.
Expose the stoke-opacity value set on the image to the embedded SVG.

Formal syntax

none | [ fill | fill-opacity | stroke | stroke-opacity ]#


In this example we have a simple SVG embedded using an <img> element.

You first need to specify on the embedding element the properties whose values you wish to expose to the embedded SVG, using the -moz-context-properties property. For example:

.img1 {
  width: 100px;
  height: 100px;
  -moz-context-properties: fill, stroke;
  fill: lime;
  stroke: purple;

Now that you've done this, the SVG image can use the values of the fill and stroke properties, for example:

<img class="img1" src="data:image/svg+xml;utf8,<svg xmlns=''>
                       <rect width='100%' height='100%' stroke-width='30px'
                       fill='context-fill red' stroke='context-stroke' fill-opacity='0.5'/></svg>">

Here we've set the image src to a data URI containing a simple SVG image; the <rect> inside has been made to take its fill and stroke values from the fill and stroke set on the <img> element by giving them the context-fill/context-stroke keywords in their values, along with a fallback color for the fill (red) which will be used in the case that the SVG is loaded standalone in a top-level window (where it will have no context element to provide context values). Note that if a color is set directly on the SVG, but then the context color is also specified, the context color overrides the direct color.

Note: You can find a working example on Github.


This property it is not defined in any CSS standard.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support ? ?551 2 No ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No ? ?551 2 ? ? ?

1. With the preference set to false, the property still works with SVGs via chrome:// or resource:// URLs

2. From version 55: this feature is behind the svg.context-properties.content.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Etiquetas y colaboradores del documento

Última actualización por: teoli,