Does jQuery.css() always return 'none' when property is not set in stylesheet?

Question

Just want to be sure.

Given the following:

if( ! ( jQuery(slider).css('max-height') == 'none') )
  return 200;
else
  ...carry on...

Can I always assume that if a CSS property is not set in the stylesheet that the .css() method will always return 'none'? It doesn't say so in the jQuery docs but it -seems- like it does. If there's a more standardised way to do this, please let me know. Thanks.

each CSS element has a default applied by the browser's stylesheet — PlantTheIdea
– PlantTheIdea, Commented Oct 29, 2013 at 20:48
So that implies that the default for 'max-height' is 'none' but it might be 'auto' or '0' for another property? Is there a standard way to determine if a property is explicitly set? (ie. not using the default)? — jchwebdev
– jchwebdev, Commented Oct 29, 2013 at 20:51

Venkata Krishna · Accepted Answer · 2013-10-29 20:52:22Z

1

No, the default for max-height is none. Hence, your condition is valid.

but, for example the default for z-index is auto. So, you have to handle each CSS property by its default value.

answered Oct 29, 2013 at 20:52

Venkata Krishna

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4 Comments

jchwebdev Over a year ago

Probably stupid question, but... Is there a W3C document which gives these values? If so, where is it?

PlantTheIdea Over a year ago

this jsFiddle might help, you can add on things as you need it => jsfiddle.net/8UbXy. and @jchwebdev, there are standards, and there are browsers, but to say all browsers are based on standards would be a l-IE.

jchwebdev Over a year ago

I'm wondering how safe my example is for long-term use. IOW: Is 'none' likely to change in the near future? OR... is there a -better- (standard) method I can use to determine whether -any- property is explicitly set? That's really what I'm looking for. THANKS!

Venkata Krishna Over a year ago

@jchwebdev - i think checking for the css attribute should be enough & I think trying to see if a property is explicitly set would be an overkill if that's even possible. I'm not sure if there is such a way though.

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