refactor: extract field-highlighter core CSS to styles folder

packages/field-highlighter/src/styles/vaadin-field-outline-styles.d.ts

@@ -0,0 +1,8 @@
+/**
+ * @license
+ * Copyright (c) 2021 - 2025 Vaadin Ltd.
+ * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
+ */
+import type { CSSResult } from 'lit';
+
+export const fieldOutlineStyles: CSSResult;

packages/field-highlighter/src/styles/vaadin-field-outline-styles.js

@@ -0,0 +1,25 @@
+/**
+ * @license
+ * Copyright (c) 2021 - 2025 Vaadin Ltd.
+ * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
+ */
+import { css } from 'lit';
+
+export const fieldOutlineStyles = css`
+  :host {
+    display: block;
+    box-sizing: border-box;
+    position: absolute;
+    inset: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    user-select: none;
+    opacity: 0;
+    --_active-user-color: transparent;
+  }
+
+  :host([has-active-user]) {
+    opacity: 1;
+  }
+`;

packages/field-highlighter/src/styles/vaadin-user-tag-styles.d.ts

@@ -0,0 +1,8 @@
+/**
+ * @license
+ * Copyright (c) 2021 - 2025 Vaadin Ltd.
+ * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
+ */
+import type { CSSResult } from 'lit';
+
+export const userTagStyles: CSSResult;

packages/field-highlighter/src/styles/vaadin-user-tag-styles.js

@@ -0,0 +1,41 @@
+/**
+ * @license
+ * Copyright (c) 2021 - 2025 Vaadin Ltd.
+ * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
+ */
+import { css } from 'lit';
+
+export const userTagStyles = css`
+  :host {
+    display: block;
+    box-sizing: border-box;
+    margin: 0 0 var(--vaadin-user-tag-offset);
+    opacity: 0;
+    height: 1.3rem;
+    transition: opacity 0.2s ease-in-out;
+    background-color: var(--vaadin-user-tag-color);
+    color: #fff;
+    cursor: default;
+    -webkit-user-select: none;
+    user-select: none;
+    --vaadin-user-tag-offset: 4px;
+  }
+
+  :host(.show) {
+    opacity: 1;
+  }
+
+  :host(:last-of-type) {
+    margin-bottom: 0;
+  }
+
+  [part='name'] {
+    overflow: hidden;
+    white-space: nowrap;
+    text-overflow: ellipsis;
+    box-sizing: border-box;
+    padding: 2px 4px;
+    height: 1.3rem;
+    font-size: 13px;
+  }
+`;

packages/field-highlighter/src/vaadin-field-highlighter-styles.d.ts → packages/field-highlighter/src/styles/vaadin-user-tags-overlay-styles.d.ts

@@ -5,8 +5,4 @@
  */
 import type { CSSResult } from 'lit';
 
-export const fieldOutlineStyles: CSSResult;
-
-export const userTagStyles: CSSResult;
-
 export const userTagsOverlayStyles: CSSResult;

packages/field-highlighter/src/styles/vaadin-user-tags-overlay-styles.js

@@ -0,0 +1,56 @@
+/**
+ * @license
+ * Copyright (c) 2021 - 2025 Vaadin Ltd.
+ * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
+ */
+import { css } from 'lit';
+import { overlayStyles } from '@vaadin/overlay/src/vaadin-overlay-styles.js';
+
+const userTagsOverlay = css`
+  :host {
+    background: transparent;
+    box-shadow: none;
+  }
+
+  :scope [part='overlay'] {
+    box-shadow: none;
+    background: transparent;
+    position: relative;
+    left: -4px;
+    padding: 4px;
+    outline: none;
+    overflow: visible;
+  }
+
+  ::slotted([part='tags']) {
+    display: flex;
+    flex-direction: column;
+    align-items: flex-start;
+  }
+
+  :host([dir='rtl']) [part='overlay'] {
+    left: auto;
+    right: -4px;
+  }
+
+  :scope [part='content'] {
+    padding: 0;
+  }
+
+  :host([opening]),
+  :host([closing]) {
+    animation: 0.14s user-tags-overlay-dummy-animation;
+  }
+
+  @keyframes user-tags-overlay-dummy-animation {
+    0% {
+      opacity: 1;
+    }
+
+    100% {
+      opacity: 1;
+    }
+  }
+`;
+
+export const userTagsOverlayStyles = [overlayStyles, userTagsOverlay];

packages/field-highlighter/src/vaadin-field-outline.js

@@ -7,10 +7,8 @@ import { html, LitElement } from 'lit';
 import { defineCustomElement } from '@vaadin/component-base/src/define.js';
 import { DirMixin } from '@vaadin/component-base/src/dir-mixin.js';
 import { PolylitMixin } from '@vaadin/component-base/src/polylit-mixin.js';
-import { registerStyles, ThemableMixin } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';
-import { fieldOutlineStyles } from './vaadin-field-highlighter-styles.js';
-
-registerStyles('vaadin-field-outline', fieldOutlineStyles, { moduleId: 'vaadin-field-outline-styles' });
+import { ThemableMixin } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';
+import { fieldOutlineStyles } from './styles/vaadin-field-outline-styles.js';
 
 /**
  * An element used internally by `<vaadin-field-highlighter>`. Not intended to be used separately.
@@ -25,6 +23,10 @@ export class FieldOutline extends ThemableMixin(DirMixin(PolylitMixin(LitElement
     return 'vaadin-field-outline';
   }
 
+  static get styles() {
+    return fieldOutlineStyles;
+  }
+
   static get properties() {
     return {
       /**

packages/field-highlighter/src/vaadin-user-tag.js

@@ -8,7 +8,7 @@ import { defineCustomElement } from '@vaadin/component-base/src/define.js';
 import { DirMixin } from '@vaadin/component-base/src/dir-mixin.js';
 import { PolylitMixin } from '@vaadin/component-base/src/polylit-mixin.js';
 import { ThemableMixin } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';
-import { userTagStyles } from './vaadin-field-highlighter-styles.js';
+import { userTagStyles } from './styles/vaadin-user-tag-styles.js';
 
 /**
  * An element used internally by `<vaadin-field-highlighter>`. Not intended to be used separately.

packages/field-highlighter/src/vaadin-user-tags-overlay.js

@@ -9,9 +9,8 @@ import { DirMixin } from '@vaadin/component-base/src/dir-mixin.js';
 import { PolylitMixin } from '@vaadin/component-base/src/polylit-mixin.js';
 import { OverlayMixin } from '@vaadin/overlay/src/vaadin-overlay-mixin.js';
 import { PositionMixin } from '@vaadin/overlay/src/vaadin-overlay-position-mixin.js';
-import { overlayStyles } from '@vaadin/overlay/src/vaadin-overlay-styles.js';
 import { ThemableMixin } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';
-import { userTagsOverlayStyles } from './vaadin-field-highlighter-styles.js';
+import { userTagsOverlayStyles } from './styles/vaadin-user-tags-overlay-styles.js';
 
 /**
  * An element used internally by `<vaadin-field-highlighter>`. Not intended to be used separately.
@@ -30,7 +29,7 @@ class UserTagsOverlay extends PositionMixin(OverlayMixin(DirMixin(ThemableMixin(
   }
 
   static get styles() {
-    return [overlayStyles, userTagsOverlayStyles];
+    return userTagsOverlayStyles;
   }
 
   /** @protected */