Remove IE10 mention, since it's not supported (#30167)

diff --git a/site/content/docs/4.3/content/reboot.md b/site/content/docs/4.3/content/reboot.md
index 6e2c297fe6599ef2177ec2fd46300e8f182c94ab..c9323b082fae854036a9375d35ff829e75af70dd 100644 (file)
--- a/site/content/docs/4.3/content/reboot.md
+++ b/site/content/docs/4.3/content/reboot.md
@@ -427,7 +427,7 @@ The default `cursor` on summary is `text`, so we reset that to `pointer` to conv
 
 ## HTML5 `[hidden]` attribute
 
-HTML5 adds [a new global attribute named `[hidden]`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/hidden), which is styled as `display: none` by default. Borrowing an idea from [PureCSS](https://purecss.io/), we improve upon this default by making `[hidden] { display: none !important; }` to help prevent its `display` from getting accidentally overridden. While `[hidden]` isn't natively supported by IE10, the explicit declaration in our CSS gets around that problem.
+HTML5 adds [a new global attribute named `[hidden]`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/hidden), which is styled as `display: none` by default. Borrowing an idea from [PureCSS](https://purecss.io/), we improve upon this default by making `[hidden] { display: none !important; }` to help prevent its `display` from getting accidentally overridden.
 
 {{< highlight html >}}
 <input type="text" hidden>