---
schema_version: "1"
id: c4da4b840b53e937eb30c4c9d3bd8edeb4cc0daac0e7f4a6a8e439efb55609c7
title: Guidelines for Using Handlebars Merge Language in Account Engagement
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/pardot_guidelines_hml.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.pardot_guidelines_hml.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 4d427792d72e5b63d9eda4d2983bb4b6dbf2275ffef4d5cd554ba69aee54aaf4
description: When using Handlebars Merge Language (HML) merge fields to personalize content in Account Engagement, keep these guidelines in mind.
products:
  - Marketing
  - Marketing Cloud Account Engagement
release: "264"
---
# Guidelines for Using Handlebars Merge Language in Account Engagement

When using Handlebars Merge Language (HML) merge fields to personalize content in Account Engagement, keep these guidelines in mind.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition"><colgroup><col></colgroup><tbody><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;">Available in: <span>All Account Engagement Editions</span></td></tr></tbody></table>

- HML is available for email templates, list emails, 1:1 emails, dynamic content, landing pages, forms, and user signatures. In Salesforce, HML is available for Engage emails.
- Emails and email templates can have up to 200 HML merge fields and 10 pieces of dynamic content.
- If a prospect’s record doesn’t have a value for a field, nothing is displayed. To avoid empty fields, define default values for fields, or use HML’s conditional logic statements to create alternative content.
- If you specified a default value for a field and set up a conditional merge field statement, the default value populates instead of the statement.
- You can't use custom fields that record and display multiple responses as HML merge fields. Those fields also don’t appear in the merge field picker when you build content.
- You can use a standard multi-select or a checkbox field as a merge field. The value displayed is the last value listed for that field in the prospect’s record.
- To use merge fields in email subject lines, use the Advanced Subject Composer in your email draft.
- When a prospect clicks the view online link in an email, the merge fields populate with the values that are on the prospect's record at that moment.
- If you include a merge field in a URL, the data populates at the time that the prospect clicks the link.

#### See Also

- [Guidelines for Using Variable Tags](https://help.salesforce.com/s/articleView?id=mktg.pardot_guidelines_variable_tags.htm&release=264.0.0&type=5 "When using variable tags, keep these guidelines in mind.")