-moz-context-properties
Non-standard: 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.
The -moz-context-properties
property can be used within privileged contexts in Firefox to share the values of specified properties of the element with a child SVG image.
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.
Syntax
/* 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;
Values
fill
-
Expose the
fill
value set on the image to the embedded SVG. stroke
-
Expose the
stroke
value set on the image to the embedded SVG. fill-opacity
-
Expose the
fill-opacity
value set on the image to the embedded SVG. stroke-opacity
-
Expose the
stoke-opacity
value set on the image to the embedded SVG.
Formal definition
Initial value | none |
---|---|
Applies to | Any element that can have an image applied to it, for example as a background-image , border-image , or list-style-image . |
Inherited | yes |
Computed value | as specified |
Animation type | discrete |
Formal syntax
Examples
Exposing fill and stroke to an SVG image
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='http://www.w3.org/2000/svg'>
<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.
Specifications
Not part of any standard.
Browser compatibility
BCD tables only load in the browser