docs: Add note for dimension bindings. (#634)

* Update index.md

* Update apps/svelte.dev/content/tutorial/02-advanced-svelte/04-advanced-bindings/04-dimensions/index.md

* explain implementation

---------

Co-authored-by: Rich Harris <[email protected]>

Author: christophsanz

apps/svelte.dev/content/tutorial/02-advanced-svelte/04-advanced-bindings/04-dimensions/index.md

@@ -2,7 +2,7 @@
 title: Dimensions
 ---
 
-You can add `clientWidth`, `clientHeight`, `offsetWidth` and `offsetHeight` bindings to any element:
+You can add `clientWidth`, `clientHeight`, `offsetWidth` and `offsetHeight` bindings to any element, and Svelte will update the bound values using a [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver):
 
 ```svelte
 /// file: App.svelte
@@ -13,3 +13,5 @@ You can add `clientWidth`, `clientHeight`, `offsetWidth` and `offsetHeight` bind
 ```
 
 These bindings are readonly — changing the values of `w` and `h` won't have any effect on the element.
+
+> [!NOTE] `display: inline` elements do not have a width or height (except for elements with 'intrinsic' dimensions, like `<img>` and `<canvas>`), and cannot be observed with a `ResizeObserver`. You will need to change the `display` style of these elements to something else, such as `inline-block`.