Think below code at head of your page:

var obj = {
  div: {
    $id: 'div',
    fontSize: '14px',
    lineHeight: 1.5,
    color: 'red'
  }
}
var result = cssobj(obj)
// you want change css later... ...

For CRUD (Create, Read, Update, Delete), dynamically change css, see below:

You want to change color to 'blue', code as below:

// using static value:
obj.div.color = 'blue'  // same as obj.div.color = ['blue']
result.update()  // color is now 'blue'
// using function as value:
obj.div.color = function(v){
  return v.result.data.color
}
result.update({color:'blue'})  // color is now 'blue'

You want to remove 'fontSize' and 'lineHeight', code as below:

It's just work as you expected:

delete obj.div.fontSize
delete obj.div.lineHeight
result.update()

You want to add 'float' and 'clear'.

It's just work as you expected:

obj.div.float = 'left'
obj.div.clear = 'both'
result.update()

You want to add ':after' rule, and div span rule

obj.div['&:after'] = { fontSize:'10px', content:'"---"' }
obj.div.span = { fontSize: '18px' }
result.update()

You want to replace the whole rule

obj.div.span = { color: 'green', fontSize: '20px' }
result.update()

You want to remove div span rule

delete obj.div.span
result.update()

Although cssobj can manage everything, you read the rule in stylesheet

result.ref.div.omRule
// => [CSSStyleRule]

Currently, cssobj don't provide result.destroy() or similar method, you should manually destroy things:

// remove <style> tag
result.cssdom.parentNode.removeChild(el)
// GC result
result = null

obj.div.span = function() {
  return { color: randomColor(), fontSize: currentSize + 'px' }
}
result.update()

the options for prop's function

If you set function for prop's value:

obj.div.span.fontSize = function(v) {
  return 1 + v.raw
}

v have below properties:

• v.raw : Source JS value for this property, that is: before any plugin, and validation check
• v.cooked : Last valid css value for this property, that is: returns like null will ignored by cssobj
• v.node : The current virtual css node generated from cssobj-core, commonly, you can check node.prop object for current rule's value
• v.result : The cssobj result object