Remove input borders by default (#14929)

This PR reverts a change we made for v4 that added borders to inputs by
default. It feels like we have to go further than this for this to
actually be useful to anyone, and since there were no borders in v3 it's
also a breaking change.

If we wanted to make form elements look more "normal" out of the box I
think we need to do something more like this:

https://play.tailwindcss.com/icCwFLVp4z?file=css

But it's a huge rabbit hole and there are so many stupid details to get
right that it feels like an insurmountable task, and if we can't go all
the way with it it's better to just maximize compatibility with v3.

---------

Co-authored-by: Adam Wathan <[email protected]>

Author: adamwathan

CHANGELOG.md

@@ -62,6 +62,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Rename `--line-height-*` variables to `--leading-*` ([#14925](https://github.com/tailwindlabs/tailwindcss/pull/14925))
 - Revert specificity of `*` variant to match v3 behavior ([#14920](https://github.com/tailwindlabs/tailwindcss/pull/14920))
 - Replace `outline-none` with `outline-hidden`, add new simplified `outline-none` utility ([#14926](https://github.com/tailwindlabs/tailwindcss/pull/14926))
+- Revert adding borders by default to form inputs ([#14929](https://github.com/tailwindlabs/tailwindcss/pull/14929))
 
 ## [4.0.0-alpha.31] - 2024-10-29
 

integrations/upgrade/index.test.ts

@@ -133,22 +133,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       @utility foo {
         color: red;
       }
@@ -240,22 +224,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       .btn {
         @apply tw:rounded-md! tw:px-2 tw:py-1 tw:bg-blue-500 tw:text-white;
       }
@@ -320,22 +288,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       .a {
         @apply flex;
       }
@@ -408,22 +360,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       @layer base {
         html {
           color: #333;
@@ -501,22 +437,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       @utility btn {
         @apply rounded-md px-2 py-1 bg-blue-500 text-white;
       }
@@ -1002,22 +922,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       --- ./src/utilities.css ---
       @utility no-scrollbar {
         &::-webkit-scrollbar {
@@ -1442,22 +1346,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       --- ./src/root.2.css ---
       /* Already contains @config */
       @import 'tailwindcss';
@@ -1482,22 +1370,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       --- ./src/root.3.css ---
       /* Inject missing @config above first @theme */
       @import 'tailwindcss';
@@ -1532,22 +1404,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       --- ./src/root.4.css ---
       /* Inject missing @config due to nested imports with tailwind imports */
       @import './root.4/base.css';
@@ -1580,22 +1436,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       --- ./src/root.4/utilities.css ---
       @import 'tailwindcss/utilities' layer(utilities);
 
@@ -1622,22 +1462,6 @@ test(
           border-color: var(--color-gray-200, currentColor);
         }
       }
-
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
       "
     `)
   },
@@ -1696,22 +1520,6 @@ test(
         }
       }
 
-      /*
-        Form elements have a 1px border by default in Tailwind CSS v4, so we've
-        added these compatibility styles to make sure everything still looks the
-        same as it did with Tailwind CSS v3.
-
-        If we ever want to remove these styles, we need to add \`border-0\` to
-        any form elements that shouldn't have a border.
-      */
-      @layer base {
-        input:where(:not([type='button'], [type='reset'], [type='submit'])),
-        select,
-        textarea {
-          border-width: 0;
-        }
-      }
-
       --- ./src/styles/components.css ---
       .btn {
         @apply bg-black px-4 py-2 rounded-md text-white font-medium hover:bg-zinc-800;