diff --git a/Gemfile b/Gemfile
index 651ee83..3bfa381 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ group :development, :test do
   gem 'puma'
   gem 'rails'
   gem 'shakapacker', '7.2.2'
-  gem 'sqlite3'
+  gem 'sqlite3', '~> 1.4'
 
   gem 'formtastic', '~> 5.0'
   gem 'nokogiri'
diff --git a/Gemfile.lock b/Gemfile.lock
index a7ba200..323fb0c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -300,7 +300,7 @@ DEPENDENCIES
   shakapacker (= 7.2.2)
   simple_form (~> 5.1)
   simplecov
-  sqlite3
+  sqlite3 (~> 1.4)
 
 BUNDLED WITH
    2.5.3
diff --git a/dev/gemfiles/rails-6.1.x.gemfile b/dev/gemfiles/rails-6.1.x.gemfile
index 4f87c50..0e3c50f 100644
--- a/dev/gemfiles/rails-6.1.x.gemfile
+++ b/dev/gemfiles/rails-6.1.x.gemfile
@@ -9,7 +9,7 @@ group :development, :test do
   gem 'puma'
   gem 'rails', '~> 6.1.0'
   gem 'shakapacker', '~> 7.1.0'
-  gem 'sqlite3'
+  gem 'sqlite3', '~> 1.4'
 
   gem 'formtastic', '~> 5.0'
   gem 'nokogiri'
diff --git a/dev/gemfiles/rails-7.0.x.gemfile b/dev/gemfiles/rails-7.0.x.gemfile
index 159a6d2..8e565ee 100644
--- a/dev/gemfiles/rails-7.0.x.gemfile
+++ b/dev/gemfiles/rails-7.0.x.gemfile
@@ -9,7 +9,7 @@ group :development, :test do
   gem 'puma'
   gem 'rails', '~> 7.0.0'
   gem 'shakapacker', '~> 7.1.0'
-  gem 'sqlite3'
+  gem 'sqlite3', '~> 1.4'
 
   gem 'formtastic', '~> 5.0'
   gem 'nokogiri'
diff --git a/npm/README.md b/npm/README.md
index 3e1df82..980cd82 100644
--- a/npm/README.md
+++ b/npm/README.md
@@ -204,6 +204,24 @@ Event handlers receive a `CustomEvent` with following detail:
 
 You can cancel an action within the `cocooned:before-<action>` callback using `event.preventDefault()`.
 
+## Attribute substitutions on create
+
+New items need to have a bunch of attributes updated before insert to make their `name`, `id` and `for` attributes consistent and unique. If you need additional substitutions to be made, you can configure them with:
+
+```javascript
+import Cocooned from '@notus.sh/cocooned'
+
+/**
+ * These 4 replacements are already set by default.
+ */
+Cocooned.registerReplacement({ attribute: 'name', delimiters: ['[', ']'] })
+// Same start and end? Don't repeat yourself.
+Cocooned.registerReplacement({ attribute: 'id', delimiters: ['_'] })
+// You can target specific tags (else '*' is implied).
+Cocooned.registerReplacement({ tag: 'label', attribute: 'for', delimiters: ['_'] })
+Cocooned.registerReplacement({ tag: 'trix-editor', attribute: 'input', delimiters: ['_'] })
+```
+
 ## Migration from a previous version
 
 These migrations steps only highlight major changes. When upgrading from a previous version, always refer to [the CHANGELOG](https://github.com/notus-sh/cocooned/blob/main/CHANGELOG.md) for new features and breaking changes.
diff --git a/npm/__tests__/unit/cocooned/plugins/core.js b/npm/__tests__/unit/cocooned/plugins/core.js
index fd09dfd..9dbc50d 100644
--- a/npm/__tests__/unit/cocooned/plugins/core.js
+++ b/npm/__tests__/unit/cocooned/plugins/core.js
@@ -23,6 +23,37 @@ describe('coreMixin', () => {
     })
   })
 
+  describe('replacements', () => {
+    it('returns default replacements', () => {
+      expect(given.extended.replacements).toEqual(expect.arrayContaining([
+        { tag: 'label', attribute: 'for', delimiters: ['_'] },
+        { tag: '*', attribute: 'id', delimiters: ['_'] },
+        { tag: '*', attribute: 'name', delimiters: ['[', ']'] }
+      ]))
+    })
+
+    it('returns replacements for Trix compatibility', () => {
+      expect(given.extended.replacements).toEqual(expect.arrayContaining([
+        { tag: 'trix-editor', attribute: 'input', delimiters: ['_'] }
+      ]))
+    })
+
+    describe('when extended', () => {
+      beforeEach(() => {
+        given.extended.registerReplacement({ attribute: given.attribute, delimiters: [given.delimiter] })
+      })
+
+      given('attribute', () => faker.lorem.word())
+      given('delimiter', () => faker.string.fromCharacters('_.-/'))
+
+      it('returns registered additional replacement', () => {
+        expect(given.extended.replacements).toEqual(expect.arrayContaining([
+          { attribute: given.attribute, delimiters: [given.delimiter], tag: '*' }
+        ]))
+      })
+    })
+  })
+
   describe('when instanciated', () => {
     beforeEach(() => {
       document.body.innerHTML = given.html
diff --git a/npm/__tests__/unit/cocooned/plugins/core/triggers/add.js b/npm/__tests__/unit/cocooned/plugins/core/triggers/add.js
index ae85316..ed0f915 100644
--- a/npm/__tests__/unit/cocooned/plugins/core/triggers/add.js
+++ b/npm/__tests__/unit/cocooned/plugins/core/triggers/add.js
@@ -1,6 +1,7 @@
 /* global given */
 
-import { Base as Cocooned } from '@notus.sh/cocooned/src/cocooned/base'
+import { coreMixin } from '@notus.sh/cocooned/src/cocooned/plugins/core'
+import { Base } from '@notus.sh/cocooned/src/cocooned/base'
 import { Builder } from '@notus.sh/cocooned/src/cocooned/plugins/core/triggers/add/builder'
 import { Add } from '@notus.sh/cocooned/src/cocooned/plugins/core/triggers/add'
 import { jest } from '@jest/globals'
@@ -13,12 +14,16 @@ import itBehavesLikeACancellableEvent from '@cocooned/tests/shared/events/cancel
 describe('Add', () => {
   beforeEach(() => { document.body.innerHTML = given.html })
 
-  given('add', () => new Add(given.addTrigger, new Cocooned(given.container), given.options))
+  given('extended', () => coreMixin(Base))
+  given('add', () => new Add(given.addTrigger, new given.extended(given.container), given.options))
   given('addTrigger', () => getAddLink(given.container))
   given('container', () => document.querySelector('[data-cocooned-container]'))
   given('builder', () => {
     const template = document.querySelector('template[data-name="template"]')
-    return new Builder(template.content, 'new_item')
+    return new Builder(
+      template.content,
+      given.extended.replacementsFor('new_item')
+    )
   })
   given('options', () => ({ builder: given.builder, node: given.addTrigger.parentElement, method: 'before' }))
 
diff --git a/npm/__tests__/unit/cocooned/plugins/core/triggers/add/builder.js b/npm/__tests__/unit/cocooned/plugins/core/triggers/add/builder.js
index 12a2a40..4ce9aad 100644
--- a/npm/__tests__/unit/cocooned/plugins/core/triggers/add/builder.js
+++ b/npm/__tests__/unit/cocooned/plugins/core/triggers/add/builder.js
@@ -1,11 +1,18 @@
 /* global given */
 
+import { coreMixin } from '@notus.sh/cocooned/src/cocooned/plugins/core'
+import { Base } from '@notus.sh/cocooned/src/cocooned/base'
 import { Builder } from '@notus.sh/cocooned/src/cocooned/plugins/core/triggers/add/builder'
 import { faker } from '@cocooned/tests/support/faker'
 
 describe('Builder', () => {
-  given('builder', () => new Builder(given.template.content, given.association))
-  given('association', () => 'new_person')
+  given('extended', () => coreMixin(Base))
+  given('builder', () => {
+    return new Builder(
+      given.template.content,
+        given.extended.replacementsFor('new_person')
+    )
+  })
   given('id', () => faker.string.numeric(5))
 
   const replacements = [
@@ -38,6 +45,17 @@ describe('Builder', () => {
           <input type="text" id="contacts_${id}_new_attribute" name="contacts[${id}][new_attribute]">
         </template>
       `
+    },
+    {
+      desc: 'Trix editor',
+      template: `
+        <input type="hidden" id="contacts_new_person_name_trix_input">
+        <trix-editor id="contacts_new_person_name" input="contacts_new_person_name_trix_input"></trix-editor>
+      `,
+      expected: (id) => `
+        <input type="hidden" id="contacts_${id}_name_trix_input">
+        <trix-editor id="contacts_${id}_name" input="contacts_${id}_name_trix_input"></trix-editor>
+      `
     }
   ]
 
diff --git a/npm/__tests__/unit/cocooned/plugins/core/triggers/add/extractor.js b/npm/__tests__/unit/cocooned/plugins/core/triggers/add/extractor.js
index 43bbad2..9b2f158 100644
--- a/npm/__tests__/unit/cocooned/plugins/core/triggers/add/extractor.js
+++ b/npm/__tests__/unit/cocooned/plugins/core/triggers/add/extractor.js
@@ -1,6 +1,7 @@
 /* global given */
 
-import { Base as Cocooned } from '@notus.sh/cocooned/src/cocooned/base'
+import { coreMixin } from '@notus.sh/cocooned/src/cocooned/plugins/core'
+import { Base } from '@notus.sh/cocooned/src/cocooned/base'
 import { Extractor } from '@notus.sh/cocooned/src/cocooned/plugins/core/triggers/add/extractor'
 import { Builder } from '@notus.sh/cocooned/src/cocooned/plugins/core/triggers/add/builder'
 import { deprecator } from '@notus.sh/cocooned/src/cocooned/deprecation'
@@ -11,7 +12,8 @@ import { getAddLink } from '@cocooned/tests/support/helpers'
 describe('Extractor', () => {
   beforeEach(() => { document.body.innerHTML = given.html })
 
-  given('extractor', () => new Extractor(given.addTrigger, new Cocooned(given.container)))
+  given('extended', () => coreMixin(Base))
+  given('extractor', () => new Extractor(given.addTrigger, new given.extended(given.container)))
   given('container', () => document.querySelector('[data-cocooned-container]'))
   given('addTrigger', () => getAddLink(document))
   given('html', () => `
diff --git a/npm/src/cocooned/plugins/core.js b/npm/src/cocooned/plugins/core.js
index 61439ba..145b2b4 100644
--- a/npm/src/cocooned/plugins/core.js
+++ b/npm/src/cocooned/plugins/core.js
@@ -1,8 +1,21 @@
 import { Add } from './core/triggers/add.js'
 import { Remove } from './core/triggers/remove.js'
+import { Replacement } from './core/triggers/add/replacement.js'
 import { clickHandler, itemDelegatedClickHandler } from '../events/handlers.js'
 
 const coreMixin = (Base) => class extends Base {
+  static registerReplacement ({ tag = '*', attribute, delimiters }) {
+    this.__replacements.push({ tag, attribute, delimiters })
+  }
+
+  static get replacements () {
+    return this.__replacements;
+  }
+
+  static replacementsFor (association) {
+    return this.replacements.map(r => new Replacement({ association, ...r }))
+  }
+
   static get selectors () {
     return {
       ...super.selectors,
@@ -31,6 +44,21 @@ const coreMixin = (Base) => class extends Base {
       })
     )
   }
+
+  replacementsFor (association) {
+    return this.constructor.replacementsFor(association);
+  }
+
+  /* Protected and private attributes and methods */
+  static __replacements = [
+    // Default attributes
+    { tag: 'label', attribute: 'for', delimiters: ['_'] },
+    { tag: '*', attribute: 'id', delimiters: ['_'] },
+    { tag: '*', attribute: 'name', delimiters: ['[', ']'] },
+
+    // Compatibility with Trix. See #65 on Github.
+    { tag: 'trix-editor', attribute: 'input', delimiters: ['_'] },
+  ];
 }
 
 export {
diff --git a/npm/src/cocooned/plugins/core/triggers/add/builder.js b/npm/src/cocooned/plugins/core/triggers/add/builder.js
index e850c14..a7b58d0 100644
--- a/npm/src/cocooned/plugins/core/triggers/add/builder.js
+++ b/npm/src/cocooned/plugins/core/triggers/add/builder.js
@@ -1,60 +1,7 @@
-/**
- * Borrowed from Lodash
- * See https://lodash.com/docs/#escapeRegExp
- */
-const reRegExpChar = /[\\^$.*+?()[\]{}|]/g
-const reHasRegExpChar = RegExp(reRegExpChar.source)
-
-class Replacement {
-  attribute
-
-  constructor (attribute, name, startDelimiter, endDelimiter = null) {
-    this.attribute = attribute
-
-    this.#name = name
-    this.#startDelimiter = startDelimiter
-    this.#endDelimiter = endDelimiter || startDelimiter
-  }
-
-  apply (node, id) {
-    const value = node.getAttribute(this.attribute)
-    if (!this.#regexp.test(value)) {
-      return
-    }
-
-    node.setAttribute(this.attribute, value.replace(this.#regexp, this.#replacement(id)))
-  }
-
-  /* Protected and private attributes and methods */
-  #name
-  #startDelimiter
-  #endDelimiter
-
-  #replacement (id) {
-    return `${this.#startDelimiter}${id}${this.#endDelimiter}$1`
-  }
-
-  get #regexp () {
-    const escaped = this.#escape(`${this.#startDelimiter}${this.#name}${this.#endDelimiter}`)
-    return new RegExp(`${escaped}(.*?)`, 'g')
-  }
-
-  #escape (string) {
-    return (string && reHasRegExpChar.test(string))
-      ? string.replace(reRegExpChar, '\\$&')
-      : (string || '')
-  }
-}
-
 class Builder {
-  constructor (documentFragment, association) {
+  constructor (documentFragment, replacements) {
     this.#documentFragment = documentFragment
-    this.#association = association
-    this.#replacements = [
-      new Replacement('for', association, '_'),
-      new Replacement('id', association, '_'),
-      new Replacement('name', association, '[', ']')
-    ]
+    this.#replacements = replacements
   }
 
   build (id) {
@@ -64,13 +11,14 @@ class Builder {
   }
 
   /* Protected and private attributes and methods */
-  #association
   #documentFragment
   #replacements
 
   #applyReplacements (node, id) {
     this.#replacements.forEach(replacement => {
-      node.querySelectorAll(`*[${replacement.attribute}]`).forEach(node => replacement.apply(node, id))
+      node.querySelectorAll(`${replacement.tag}[${replacement.attribute}]`).forEach(node => {
+        return replacement.apply(node, id)
+      })
     })
 
     node.querySelectorAll('template').forEach(template => {
diff --git a/npm/src/cocooned/plugins/core/triggers/add/extractor.js b/npm/src/cocooned/plugins/core/triggers/add/extractor.js
index 0735d69..704f73c 100644
--- a/npm/src/cocooned/plugins/core/triggers/add/extractor.js
+++ b/npm/src/cocooned/plugins/core/triggers/add/extractor.js
@@ -39,7 +39,10 @@ class Extractor {
       return null
     }
 
-    return new Builder(template.content, `new_${this.#dataset.association}`)
+    return new Builder(
+      template.content,
+      this.#cocooned.replacementsFor(`new_${this.#dataset.association}`)
+    );
   }
 
   _extractCount () {
diff --git a/npm/src/cocooned/plugins/core/triggers/add/replacement.js b/npm/src/cocooned/plugins/core/triggers/add/replacement.js
new file mode 100644
index 0000000..0a57585
--- /dev/null
+++ b/npm/src/cocooned/plugins/core/triggers/add/replacement.js
@@ -0,0 +1,53 @@
+/**
+ * Borrowed from Lodash
+ * See https://lodash.com/docs/#escapeRegExp
+ */
+const reRegExpChar = /[\\^$.*+?()[\]{}|]/g
+const reHasRegExpChar = RegExp(reRegExpChar.source)
+
+class Replacement {
+  attribute
+  tag
+
+  constructor ({ tag = '*', attribute, association, delimiters }) {
+    this.attribute = attribute
+    this.tag = tag
+
+    this.#association = association
+    this.#startDelimiter = delimiters[0]
+    this.#endDelimiter = delimiters[delimiters.length - 1]
+  }
+
+  apply (node, id) {
+    const value = node.getAttribute(this.attribute)
+    if (!this.#regexp.test(value)) {
+      return
+    }
+
+    node.setAttribute(this.attribute, value.replace(this.#regexp, this.#replacement(id)))
+  }
+
+  /* Protected and private attributes and methods */
+  #association
+  #startDelimiter
+  #endDelimiter
+
+  #replacement (id) {
+    return `${this.#startDelimiter}${id}${this.#endDelimiter}$1`
+  }
+
+  get #regexp () {
+    const escaped = this.#escape(`${this.#startDelimiter}${this.#association}${this.#endDelimiter}`)
+    return new RegExp(`${escaped}(.*?)`, 'g')
+  }
+
+  #escape (string) {
+    return (string && reHasRegExpChar.test(string))
+        ? string.replace(reRegExpChar, '\\$&')
+        : (string || '')
+  }
+}
+
+export {
+  Replacement
+}