CSS negation pseudo-class :not() for parent/ancestor elements
css, css-selectors, html
Solution
Doesn't this read, "Select all `h1` elements that have an ancestor that is not a `div` element...?"
It does. But in a typical HTML document, every `h1` has at least two ancestors that are not `div` elements — and those ancestors are none other than `body` and `html`.
This is the problem with trying to filter ancestors using `:not()`: it just doesn't work reliably, especially when the `:not()` is not being qualified by some other selector such as a type selector or a class selector, e.g. `.foo:not(div)`. You'll have a much easier time simply applying styles to all `h1` elements and overriding them with `div h1`.
In Selectors 4, `:not()` has been enhanced to accept full complex selectors containing combinators, including the descendant combinator. Whether this will be implemented in the fast profile (and thus CSS) remains to be tested and confirmed, but once it is implemented, then you will be able to use it to exclude elements with certain ancestors. Due to how selectors work, the negation has to be done on the element itself and not the ancestor in order to work reliably, and therefore the syntax will look a little different:
h1:not(div h1) { color: #900; }
Anyone who's familiar with jQuery will quickly point out that this selector works in jQuery today. This is one of a number of disparities between Selector 3's `:not()` and jQuery's `:not()`, which Selectors 4 seeks to rectify.
Problem
This is driving me nuts: HTML: ``` <div><h1>Hello World!</h1></div> ``` CSS: ``` *:not(div) h1 { color: #900; } ``` Doesn't this read, "Select all `h1` elements that have an ancestor that is not a `div` element...?" Thus, "Hello World!" should not be coloured red, yet it still is. For the above markup, adding the child combinator works: ``` *:not(div) > h1 { color: #900; } ``` But doesn't affect the `h1` element if it is not a child of a `div` element. For example: ``` <div><article><h1>Hello World!</h1></article></div> ``` Which is why I'd like to indicate the `h1` element as a descendant, not a child, of the `div` element. Anyone?