Add self-baseline-last (#17476)

This PR also adds a new `self-baseline-last` utility similar to
`items-baseline-last` added previously. We've also discussed adding a
`content-baseline-last` utility but since the browser support for this
[is very
limited](https://caniuse.com/mdn-css_properties_align-content_flex_context_last_baseline)
and we weren't able to get this to do anything even in the supported
browsers, we decided against it.

## Test plan

Updated the utility tests.

CHANGELOG.md

@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - _Experimental_: Add `details-content` variant ([#15319](https://github.com/tailwindlabs/tailwindcss/pull/15319))
 - _Experimental_: Add `inverted-colors` variant ([#11693](https://github.com/tailwindlabs/tailwindcss/pull/11693))
 - _Experimental_: Add `noscript` variant ([#11929](https://github.com/tailwindlabs/tailwindcss/pull/11929), [#17431](https://github.com/tailwindlabs/tailwindcss/pull/17431))
-- _Experimental_: Add `items-baseline-last` utility ([#13888](https://github.com/tailwindlabs/tailwindcss/pull/13888))
+- _Experimental_: Add `items-baseline-last` and `self-baseline-last` utilities ([#13888](https://github.com/tailwindlabs/tailwindcss/pull/13888), [#17476](https://github.com/tailwindlabs/tailwindcss/pull/17476))
 - _Experimental_: Add `pointer-none`, `pointer-coarse`, and `pointer-fine` variant ([#16946](https://github.com/tailwindlabs/tailwindcss/pull/16946))
 - _Experimental_: Add `any-pointer-none`, `any-pointer-coarse`, and `any-pointer-fine` variants ([#16941](https://github.com/tailwindlabs/tailwindcss/pull/16941))
 - _Experimental_: Add safe alignment utilities ([#14607](https://github.com/tailwindlabs/tailwindcss/pull/14607))

packages/tailwindcss/src/__snapshots__/intellisense.test.ts.snap

@@ -9608,6 +9608,7 @@ exports[`getClassList 1`] = `
   "select-text",
   "self-auto",
   "self-baseline",
+  "self-baseline-last",
   "self-center",
   "self-center-safe",
   "self-end",

packages/tailwindcss/src/utilities.test.ts

@@ -8946,6 +8946,7 @@ test('self', async () => {
       'self-center-safe',
       'self-stretch',
       'self-baseline',
+      'self-baseline-last',
     ]),
   ).toMatchInlineSnapshot(`
     ".self-auto {
@@ -8956,6 +8957,10 @@ test('self', async () => {
       align-self: baseline;
     }
 
+    .self-baseline-last {
+      align-self: last baseline;
+    }
+
     .self-center {
       align-self: center;
     }

packages/tailwindcss/src/utilities.ts

@@ -2038,6 +2038,9 @@ export function createUtilities(theme: Theme) {
   }
   staticUtility('self-stretch', [['align-self', 'stretch']])
   staticUtility('self-baseline', [['align-self', 'baseline']])
+  if (enableBaselineLast) {
+    staticUtility('self-baseline-last', [['align-self', 'last baseline']])
+  }
 
   staticUtility('justify-self-auto', [['justify-self', 'auto']])
   staticUtility('justify-self-start', [['justify-self', 'flex-start']])