On Tue, Feb 4, 2014 at 4:47 PM, Daniel Freedman <[email protected]> wrote:

> :host[ .. ] doesn't work because the rule crosses the shadowdom style
> encapsulation boundary.
> :host( [ .. ] ) is allowed to cross the boundary.
>
> :host( ) was changed to only look at the host element, removing the
> ancestor walk (that functionality was given to ::ancestor(), we're working
> on a better name).
>

Ah, much more clear now. Thanks!


>
>
> On Tue, Feb 4, 2014 at 4:43 PM, Justin Fagnani 
> <[email protected]>wrote:
>
>>
>>
>>
>> On Tue, Feb 4, 2014 at 4:22 PM, Steve Orvell <[email protected]> wrote:
>>
>>> Here's a simplified example:
>>>
>>> http://jsbin.com/aXojEti/1/edit
>>>
>>>
>>> On Tue, Feb 4, 2014 at 4:20 PM, Steve Orvell <[email protected]> wrote:
>>>
>>>> :host may only be qualified via parens, like this: :host([attr="xyz"])
>>>>
>>>> So, this should work:
>>>>
>>>> :host([attr="xyz"]) content[select=":nth-child(1)"]::content > * {
>>>>   font-style: italic;
>>>> }
>>>>
>>>
>> I think this would give a very different behavior than intended. Sergey
>> is trying to change layout based on an attribute on the host, if he instead
>> matching on that attribute on any ancestor, then it can't compose.
>>
>> Why doesn't :host[...] work? :host and pseudo-classes work.
>>
>>
>>
>>>
>>>>
>>>> On Tue, Feb 4, 2014 at 4:11 PM, Sergey Shevchenko 
>>>> <[email protected]>wrote:
>>>>
>>>>> Hi there,
>>>>>
>>>>> I have the following Polymer element definition:
>>>>>
>>>>>  <polymer-element name="my-element" attributes="attr">
>>>>>   <template>
>>>>>      <style>
>>>>>       @import url("my_element.css");
>>>>>     </style>
>>>>>
>>>>>     <content select=":nth-child(1)"></content>
>>>>>     ...
>>>>> </polymer-element>
>>>>>
>>>>> What I need is a CSS selector that would match my <content>, but only
>>>>> when the `attr` attribute on the host element is "xyz". I've tried all
>>>>> these:
>>>>>
>>>>> :host[attr="xyz"] content[select=":nth-child(1)"]::content > * {
>>>>>   font-style: italic;
>>>>> }
>>>>>
>>>>> :host[attr="xyz"] > content[select=":nth-child(1)"]::content > * {
>>>>>   font-style: italic;
>>>>> }
>>>>>
>>>>> content[select=":nth-child(1)"]::content[attr="xyz"] > * {
>>>>>   font-style: italic;
>>>>> }
>>>>>
>>>>>
>>>>> None of these worked. At the same time, each of the two sub-selectors
>>>>> works individually:
>>>>>
>>>>> :host[attr="xyz"] {
>>>>>   font-style: italic;
>>>>> }
>>>>>
>>>>> content[select=":nth-child(1)"]::content > * {
>>>>>   font-style: italic;
>>>>> }
>>>>>
>>>>> So I'm just looking for the right way to combine them.
>>>>>
>>>>> Thanks!
>>>>>
>>>>>  Follow Polymer on Google+: plus.google.com/107187849809354688692
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>>>>
>>>>
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>>
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>
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