craft/src/components/forms/ContactForm.toHtml.test.ts

@@ -6,12 +6,12 @@ const toHtml = (ContactForm as any).toHtml;
 describe('ContactForm.toHtml relay wiring', () => {
   test('with recipientEmail: emits marker, placeholder action, honeypot', () => {
     const { html } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', fields: [] }, '');
-    expect(html).toMatch(/<!--WHP-FORM id="F[0-9a-z]+" recipient="a@b.com" thankyou="\/thx"-->/);
-    expect(html).toMatch(/action="__WHP_FORM_ACTION__F[0-9a-z]+__"/);
+    expect(html).toMatch(/<!--WHP-FORM id="F_[0-9a-z]+" recipient="a@b.com" thankyou="\/thx"-->/);
+    expect(html).toMatch(/action="__WHP_FORM_ACTION__F_[0-9a-z]+__"/);
     expect(html).toContain('method="POST"');
     expect(html).toContain('name="_gotcha"');
     // marker id and action id match
-    const mid = html.match(/id="(F[0-9a-z]+)"/)![1];
+    const mid = html.match(/id="(F_[0-9a-z]+)"/)![1];
     expect(html).toContain(`__WHP_FORM_ACTION__${mid}__`);
   });
 
@@ -64,6 +64,28 @@ describe('ContactForm.toHtml successMessage', () => {
   });
 });
 
+describe('ContactForm.toHtml relay marker deterministic + unique via node id (no Math.random)', () => {
+  test('same node id -> identical marker+placeholder ids across two calls', () => {
+    const { html: html1 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', fields: [] }, '', 'node-cf1');
+    const { html: html2 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', fields: [] }, '', 'node-cf1');
+    expect(html1).toBe(html2);
+  });
+
+  test('marker id always equals the placeholder id it pairs with', () => {
+    const { html } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', fields: [] }, '', 'node-cf1');
+    const mid = html.match(/<!--WHP-FORM id="([^"]+)"/)![1];
+    expect(html).toContain(`action="__WHP_FORM_ACTION__${mid}__"`);
+  });
+
+  test('two different node ids -> different fids', () => {
+    const { html: html1 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', fields: [] }, '', 'node-cf1');
+    const { html: html2 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', fields: [] }, '', 'node-cf2');
+    const mid1 = html1.match(/<!--WHP-FORM id="([^"]+)"/)![1];
+    const mid2 = html2.match(/<!--WHP-FORM id="([^"]+)"/)![1];
+    expect(mid1).not.toBe(mid2);
+  });
+});
+
 describe('ContactForm.toHtml accessibility (F2.1)', () => {
   const fields = [
     { type: 'text' as const, label: 'Name', name: 'name', placeholder: 'Your name', required: true },

craft/src/components/forms/ContactForm.tsx

@@ -167,7 +167,7 @@ ContactForm.craft = {
 
 /* ---------- HTML export ---------- */
 
-(ContactForm as any).toHtml = (props: ContactFormProps, _childrenHtml: string) => {
+(ContactForm as any).toHtml = (props: ContactFormProps, _childrenHtml: string, nodeId?: string) => {
   const formStyle = cssPropsToString({
     padding: '32px',
     display: 'flex',
@@ -212,7 +212,7 @@ ContactForm.craft = {
     alignSelf: 'flex-start',
   });
 
-  const { marker, actionAttr, honeypot } = relayFormWiring(props.recipientEmail, props.thankYouUrl, props.formAction);
+  const { marker, actionAttr, honeypot } = relayFormWiring(props.recipientEmail, props.thankYouUrl, props.formAction, nodeId);
 
   // The form-sender relay delivers success via a full-page 303 redirect
   // (to thankYouUrl or a hosted thanks.php page) -- there is no in-page JS

craft/src/components/forms/FormContainer.toHtml.test.ts

@@ -6,14 +6,14 @@ const toHtml = (FormContainer as any).toHtml;
 describe('FormContainer.toHtml relay wiring', () => {
   test('with recipientEmail: marker + placeholder action + honeypot, forces POST', () => {
     const { html } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx', method: 'GET' }, '<input name="email">');
-    expect(html).toMatch(/<!--WHP-FORM id="F[0-9a-z]+" recipient="a@b.com" thankyou="\/thx"-->/);
-    expect(html).toMatch(/action="__WHP_FORM_ACTION__F[0-9a-z]+__"/);
+    expect(html).toMatch(/<!--WHP-FORM id="F_[0-9a-z]+" recipient="a@b.com" thankyou="\/thx"-->/);
+    expect(html).toMatch(/action="__WHP_FORM_ACTION__F_[0-9a-z]+__"/);
     expect(html).toContain('method="POST"');            // relay forces POST even though method=GET
     expect(html).toContain('name="_gotcha"');
     // honeypot precedes the form's children
     expect(html.indexOf('_gotcha')).toBeLessThan(html.indexOf('name="email"'));
     // marker id === action id
-    const mid = html.match(/id="(F[0-9a-z]+)"/)![1];
+    const mid = html.match(/id="(F_[0-9a-z]+)"/)![1];
     expect(html).toContain(`__WHP_FORM_ACTION__${mid}__`);
   });
 
@@ -24,4 +24,18 @@ describe('FormContainer.toHtml relay wiring', () => {
     expect(html).toContain('action="/legacy"');
     expect(html).toContain('<input name="email">');
   });
+
+  test('same node id -> identical marker+placeholder ids across two calls', () => {
+    const { html: html1 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx' }, '<input name="email">', 'node-fc1');
+    const { html: html2 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx' }, '<input name="email">', 'node-fc1');
+    expect(html1).toBe(html2);
+  });
+
+  test('two different node ids -> different fids', () => {
+    const { html: html1 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx' }, '<input name="email">', 'node-fc1');
+    const { html: html2 } = toHtml({ recipientEmail: 'a@b.com', thankYouUrl: '/thx' }, '<input name="email">', 'node-fc2');
+    const mid1 = html1.match(/<!--WHP-FORM id="([^"]+)"/)![1];
+    const mid2 = html2.match(/<!--WHP-FORM id="([^"]+)"/)![1];
+    expect(mid1).not.toBe(mid2);
+  });
 });

craft/src/components/forms/FormContainer.tsx

@@ -68,12 +68,12 @@ FormContainer.craft = {
 
 /* ---------- HTML export ---------- */
 
-(FormContainer as any).toHtml = (props: FormContainerProps, childrenHtml: string) => {
+(FormContainer as any).toHtml = (props: FormContainerProps, childrenHtml: string, nodeId?: string) => {
   const styleStr = cssPropsToString({
     padding: '24px',
     ...props.style,
   });
-  const { useRelay, marker, actionAttr, honeypot } = relayFormWiring(props.recipientEmail, props.thankYouUrl, props.action);
+  const { useRelay, marker, actionAttr, honeypot } = relayFormWiring(props.recipientEmail, props.thankYouUrl, props.action, nodeId);
   const method = useRelay ? 'POST' : (props.method || 'POST'); // relay requires POST
   const body = honeypot + childrenHtml;                        // honeypot as first child
   return {

craft/src/components/sections/NumberCounter.toHtml.test.ts

@@ -0,0 +1,49 @@
+import { describe, test, expect } from 'vitest';
+import { NumberCounter } from './NumberCounter';
+
+const toHtml = (NumberCounter as any).toHtml;
+
+const counters = [
+  { number: 150, suffix: '+', label: 'Projects' },
+  { number: 50, suffix: '+', label: 'Clients' },
+];
+
+describe('NumberCounter.toHtml deterministic + unique scope ids (thread node id, no Math.random)', () => {
+  test('same node id -> identical output across calls (deterministic)', () => {
+    const { html: html1 } = toHtml({ counters }, '', 'node-nc1');
+    const { html: html2 } = toHtml({ counters }, '', 'node-nc1');
+    expect(html1).toBe(html2);
+  });
+
+  test('different node ids -> distinct, non-colliding nc_ scopes (identical props, no collision)', () => {
+    const { html: html1 } = toHtml({ counters }, '', 'node-nc1');
+    const { html: html2 } = toHtml({ counters }, '', 'node-nc2');
+    const wrapId1 = html1.match(/<div id="(nc_[^"]+)"/)![1];
+    const wrapId2 = html2.match(/<div id="(nc_[^"]+)"/)![1];
+    expect(wrapId1).not.toBe(wrapId2);
+  });
+
+  test('wrapper id, per-counter ids, and inline script agree on the same uid', () => {
+    const { html } = toHtml({ counters }, '', 'node-nc1');
+    const wrapId = html.match(/<div id="(nc_[^"]+)"/)![1];
+    expect(html).toContain(`id="${wrapId}_n0"`);
+    expect(html).toContain(`id="${wrapId}_n1"`);
+    expect(html).toContain(`var uid="${wrapId}"`);
+    expect(html).toContain('document.getElementById(uid)');
+    expect(html).toContain('document.getElementById(uid+"_n"+i)');
+  });
+
+  test('no nodeId (legacy 2-arg call): still deterministic across repeated calls, not random', () => {
+    const { html: html1 } = toHtml({ counters }, '');
+    const { html: html2 } = toHtml({ counters }, '');
+    expect(html1).toBe(html2);
+  });
+
+  test('two different node ids never collide even with default (no counters override) props', () => {
+    const { html: html1 } = toHtml({}, '', 'node-a');
+    const { html: html2 } = toHtml({}, '', 'node-b');
+    const wrapId1 = html1.match(/<div id="(nc_[^"]+)"/)![1];
+    const wrapId2 = html2.match(/<div id="(nc_[^"]+)"/)![1];
+    expect(wrapId1).not.toBe(wrapId2);
+  });
+});

craft/src/components/sections/NumberCounter.tsx

@@ -1,7 +1,7 @@
 import React, { CSSProperties } from 'react';
 import { useNode, UserComponent } from '@craftjs/core';
 import { cssPropsToString } from '../../utils/style-helpers';
-import { escapeHtml, escapeAttr } from '../../utils/escape';
+import { escapeHtml, escapeAttr, scopeId } from '../../utils/escape';
 
 interface Counter {
   number: number;
@@ -109,7 +109,7 @@ NumberCounter.craft = {
 
 /* ---------- HTML export ---------- */
 
-(NumberCounter as any).toHtml = (props: NumberCounterProps, _childrenHtml: string) => {
+(NumberCounter as any).toHtml = (props: NumberCounterProps, _childrenHtml: string, nodeId?: string) => {
   const {
     counters = defaultCounters,
     columns = 4,
@@ -120,7 +120,13 @@ NumberCounter.craft = {
   } = props;
 
   const items = counters.length > 0 ? counters : defaultCounters;
-  const uid = 'nc_' + Math.random().toString(36).slice(2, 8);
+
+  // Deterministic AND unique id for this counter instance's wrapper/span
+  // ids and getElementById() calls inside its inline script -- scoped on
+  // the Craft node id so two NumberCounter instances (e.g. both left at
+  // default props) don't collide and end up animating each other's digits.
+  const seed = items.map((c) => `${c.number}${c.suffix}::${c.label}`).join('|');
+  const uid = scopeId(nodeId, seed, 'nc');
 
   const sectionStyle = cssPropsToString({
     padding: '60px 20px',

craft/src/utils/form-relay-wiring.test.ts

@@ -0,0 +1,38 @@
+import { describe, test, expect } from 'vitest';
+import { relayFormWiring } from './form-relay-wiring';
+
+describe('relayFormWiring deterministic + unique fid (thread node id, no Math.random)', () => {
+  test('no recipient: no relay, no marker, no fid needed', () => {
+    const wiring = relayFormWiring(undefined, undefined, '/legacy', 'node-1');
+    expect(wiring.useRelay).toBe(false);
+    expect(wiring.marker).toBe('');
+  });
+
+  test('same node id -> identical marker + placeholder ids across two calls (deterministic)', () => {
+    const w1 = relayFormWiring('a@b.com', '/thx', undefined, 'node-form1');
+    const w2 = relayFormWiring('a@b.com', '/thx', undefined, 'node-form1');
+    expect(w1.marker).toBe(w2.marker);
+    expect(w1.actionAttr).toBe(w2.actionAttr);
+  });
+
+  test('marker id and placeholder id always match each other', () => {
+    const w = relayFormWiring('a@b.com', '/thx', undefined, 'node-form1');
+    const mid = w.marker.match(/id="([^"]+)"/)![1];
+    expect(w.actionAttr).toBe(`__WHP_FORM_ACTION__${mid}__`);
+  });
+
+  test('different node ids -> different fids (no collision)', () => {
+    const w1 = relayFormWiring('a@b.com', '/thx', undefined, 'node-form1');
+    const w2 = relayFormWiring('a@b.com', '/thx', undefined, 'node-form2');
+    const mid1 = w1.marker.match(/id="([^"]+)"/)![1];
+    const mid2 = w2.marker.match(/id="([^"]+)"/)![1];
+    expect(mid1).not.toBe(mid2);
+  });
+
+  test('no nodeId (legacy call): still deterministic across repeated calls, not random', () => {
+    const w1 = relayFormWiring('a@b.com', '/thx', undefined);
+    const w2 = relayFormWiring('a@b.com', '/thx', undefined);
+    expect(w1.marker).toBe(w2.marker);
+    expect(w1.actionAttr).toBe(w2.actionAttr);
+  });
+});

craft/src/utils/form-relay-wiring.ts

@@ -9,7 +9,7 @@
  * HTML — see PR #47 review).
  */
 
-import { escapeAttr, safeUrl } from './escape';
+import { escapeAttr, safeUrl, scopeId } from './escape';
 
 export interface RelayWiring {
   /** true when a recipient is set (relay path); false = legacy formAction fallback */
@@ -26,16 +26,21 @@ export interface RelayWiring {
  * @param recipientEmail the "Send submissions to" address (empty/undefined = no relay)
  * @param thankYouUrl    optional post-submit redirect (blank = hosted thank-you page)
  * @param fallbackAction the form's existing action to use when no recipient is set
+ * @param nodeId         the Craft node id of the calling form component, used to scope
+ *                        the marker/placeholder id deterministically and uniquely --
+ *                        see `scopeId` in ./escape. Falls back to a stable hash of the
+ *                        recipient/thankYouUrl/fallbackAction when omitted (never random).
  */
 export function relayFormWiring(
   recipientEmail: string | undefined,
   thankYouUrl: string | undefined,
   fallbackAction: string | undefined,
+  nodeId?: string,
 ): RelayWiring {
   if (!recipientEmail) {
     return { useRelay: false, marker: '', actionAttr: escapeAttr(safeUrl(fallbackAction || '#')), honeypot: '' };
   }
-  const fid = 'F' + Math.random().toString(36).slice(2, 8);
+  const fid = scopeId(nodeId, `${recipientEmail}::${thankYouUrl || ''}::${fallbackAction || ''}`, 'F');
   return {
     useRelay: true,
     marker: `<!--WHP-FORM id="${fid}" recipient="${escapeAttr(recipientEmail)}" thankyou="${escapeAttr(thankYouUrl || '')}"-->`,