How to use CSS attribute selector for an SVG element with namespaced attribute href?

Question

Why can't I select elements by their href-attribute?

CSS

/* Works */
svg image[type=overlay]{
    outline: 3px solid blue;
}

/* Doesn't work */
svg image[href*='temp']{
    outline: 5px solid red;
}

/* Doesn't work either */
svg image[href='wcs/WFL/position/temp2.png']{
    outline: 5px solid red;
}

SVG

<image display="inline" type="overlay" width="148" height="90" x="920" y="918" transform="" href="wcs/WFL/position/temp2.png"><title>B02003
Temp: 2</title></image>

I did notice the browsers turns the href attribute to xlink:href but image[xlink:href*='temp'] doesn't work either.

How can I make this work?

Edit: The SVG uses the following namespaces, I think this causes the problem but I don't know how to get around it.

xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"

Fiddle

SW4 · Accepted Answer · 2014-12-10 10:46:08Z

10

Demo Fiddle

Firstly, in order to use xlink slectors, you need to to declare the xlink namespace at the top of your stylesheet according to the spec:

@namespace xlink 'http://www.w3.org/1999/xlink';

Then, you can use the following attribute selector with a namespace prefix:

svg image[xlink|href*="temp"] {
    outline: 3px solid red;
}

The attribute name in an attribute selector is given as a CSS qualified name: a namespace prefix that has been previously declared may be prepended to the attribute name separated by the namespace separator "vertical bar" (|). In keeping with the Namespaces in the XML recommendation

answered Dec 10, 2014 at 10:46

SW4

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2 Comments

AmeliaBR Over a year ago

Alternatively, you can use the wildcard namespace on the attribute [*|href] (unless you have images with two different types of href attributes!). More at this answer about .querySelector(), for which declaring namespaces isn't an option.

AlexLaforge Over a year ago

Pleae note that this namespace declaration have to be placed at the top of your css file. More precisely, as stated in this thread stackoverflow.com/questions/24628932/…, a normal CSS rule must not precede any \@namespace rules, or the \@namespace rules are invalid. The CSS Namespaces Module Level 3 w3.org/TR/css3-namespace says that > Any \@namespace rules must follow all \@charset and \@import rules and precede all other non-ignored at-rules and style rules in a style sheet.

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