---
title: "Supported Placeholder"
slug: "supported-palceholder"
updated: 2025-08-27T06:42:20Z
published: 2025-08-27T06:42:20Z
canonical: "docs.mapp.com/supported-palceholder"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported Placeholder

When tracking accelerated mobile pages, there are many predefined placeholders that you can use to add more information to track requests.

Use the **${varName}** format in a requests string or use the default placeholders. The **amp-analytics** tag will replace the placeholder with the actual value.

**Examples**

| Placeholder | Data Type | Description | Example |
| --- | --- | --- | --- |
| ${ampdocHost} | String | AMP page URL | "extraUrlParams": {"pageParameter1":"${ampdocHost}"} |
| ${title} | String | Title of the current document | "extraUrlParams": {"pageParameter1":"${title}"} |
| ${pageLoadTime} | String | Loading time of the page (ms) | "extraUrlParams": {"pageParameter1":"${pageLoadTime}"} |
| AMPDOC_HOST | String | AMP page-URL | "extraUrlParams": {"pageParameter1":"AMPDOC_HOST"} |
| TITLE | String | Title of the current document | "extraUrlParams": {"pageParameter1":"TITLE"} |
| PAGE_LOAD_TIME | String | Loading time of the page (ms) | "extraUrlParams": {"pageParameter1":"PAGE_LOAD_TIME"} |
| RANDOM | String | Random number | "extraUrlParams": {"pageParameter1":"RANDOM"} |

> [!NOTE]
> You can find an overview of all placeholders under the following links:
> 
> - [Analytics variables](https://github.com/ampproject/amphtml/blob/master/extensions/amp-analytics/analytics-vars.md)
> - [AMP placeholder](https://github.com/ampproject/amphtml/blob/main/docs/spec/amp-var-substitutions.md)
> - [Video analytics variables](https://github.com/ampproject/amphtml/blob/master/extensions/amp-analytics/amp-video-analytics.md)