HTML Service

The HTML service in Apps Script allows applications to return HTML, typically for user interfaces.
Key classes for working with HTML in Apps Script include HtmlOutput, HtmlService, and HtmlTemplate.
HtmlOutput objects represent HTML content that can be served from a script and offer methods for managing content, meta tags, and display properties.
HtmlService is the main service for creating and managing HtmlOutput and HtmlTemplate objects.
HtmlTemplate allows for dynamically constructing HTML content before evaluating it to an HtmlOutput object.

This service allows Apps Script applications to return HTML, usually as a user interface. If you're new to using this class, we recommend you also see the guide to Html Service

Classes

`HtmlOutput`

Methods

Method	Return type	Brief description
`addMetaTag(name, content)`	`HtmlOutput`	Adds a meta tag to the page.
`append(addedContent)`	`HtmlOutput`	Appends new content to the content of this `HtmlOutput`.
`appendUntrusted(addedContent)`	`HtmlOutput`	Appends new content to the content of this `HtmlOutput`, using contextual escaping.
`asTemplate()`	`HtmlTemplate`	Returns an `HtmlTemplate` backed by this `HtmlOutput`.
`clear()`	`HtmlOutput`	Clears the current content.
`getAs(contentType)`	`Blob`	Return the data inside this object as a blob converted to the specified content type.
`getBlob()`	`Blob`	Return the data inside this object as a blob.
`getContent()`	`String`	Gets the content of this `HtmlOutput`.
`getFaviconUrl()`	`String`	Gets the URL for a favicon link tag added to the page by calling `setFaviconUrl(iconUrl)`.
`getHeight()`	`Integer`	Gets the initial height of the custom dialog in Google Docs, Sheets, or Forms.
`getMetaTags()`	`HtmlOutputMetaTag[]`	Gets an array of objects that represent meta tags added to the page by calling `addMetaTag(name, content)`.
`getTitle()`	`String`	Gets the title of the output page.
`getWidth()`	`Integer`	Gets the initial width of the custom dialog in Google Docs, Sheets, or Forms.
`setContent(content)`	`HtmlOutput`	Sets the content of this `HtmlOutput`.
`setFaviconUrl(iconUrl)`	`HtmlOutput`	Adds a link tag for a favicon to the page.
`setHeight(height)`	`HtmlOutput`	Sets the initial height of the custom dialog in Google Docs, Sheets, or Forms.
`setSandboxMode(mode)`	`HtmlOutput`	This method now has no effect — previously it set the `sandbox mode` used for client-side scripts.
`setTitle(title)`	`HtmlOutput`	Sets the title of the output page.
`setWidth(width)`	`HtmlOutput`	Sets the initial width of a custom dialog in Google Docs, Sheets, or Forms.
`setXFrameOptionsMode(mode)`	`HtmlOutput`	Sets the state of the page's `X-Frame-Options` header, which controls clickjacking prevention.

Methods

Method	Return type	Brief description
`getContent()`	`String`	Gets the content of this meta tag.
`getName()`	`String`	Gets the name of this `HtmlOutputMetaTag`.

`HtmlService`

`HtmlTemplate`

Methods

Method	Return type	Brief description
`evaluate()`	`HtmlOutput`	Evaluates this template and returns an `HtmlOutput` object.
`getCode()`	`String`	Generates a string of JavaScript code, based on the template file, that can be evaluated.
`getCodeWithComments()`	`String`	Generates a string of JavaScript code that can be evaluated, with each line of the code containing the original line from the template as a comment.
`getRawContent()`	`String`	Returns the unprocessed content of this template.

`SandboxMode`

Properties

Property	Type	Description
`EMULATED`	`Enum`	A legacy sandbox mode that emulates ECMAScript 5 strict mode using only the features available in ECMAScript 3.
`IFRAME`	`Enum`	A sandbox mode that uses iframe sandboxing instead of the Caja sandbox technology used by the `EMULATED` and `NATIVE` modes.
`NATIVE`	`Enum`	A sandbox mode that is built on top of ECMAScript 5 strict mode.

`XFrameOptionsMode`

Properties

Property	Type	Description
`ALLOWALL`	`Enum`	No `X-Frame-Options` header will be set.
`DEFAULT`	`Enum`	Sets the default value for the `X-Frame-Options` header, which preserves normal security assumptions.