To call an enum, you call its parent class, name, and property. For example,
HtmlService.SandboxMode.IFRAME.
The NATIVE and EMULATED modes were
deprecated on October 13, 2015 and both are now sunset. Only IFRAME mode is now
supported.
To protect users from being served malicious HTML or JavaScript, client-side code served from
HTML service executes in a security sandbox that imposes restrictions on the code. The method
HtmlOutput.setSandboxMode(mode) previously allowed script authors to choose
between different versions of the sandbox, but now has no effect. For more information, see the
guide to restrictions in HTML service.
The IFRAME mode imposes many fewer restrictions than the other sandbox modes and runs
fastest, but does not work at all in certain older browsers, including Internet Explorer 9. The
sandbox mode can also be read in a client-side script by inspecting google.script.sandbox.mode. Note that this property returns the actual mode on the client, which
may differ from the mode requested on the server if the requested mode is not supported in the
user's browser.
<!-- Read the sandbox mode (in a client-side script). -->
<script>
alert(google.script.sandbox.mode);
</script>
Properties
Property
Type
Description
EMULATED
Enum
A legacy sandbox mode that emulates ECMAScript 5 strict mode using only the features available
in ECMAScript 3. This mode was the default prior to February 2014.
A sandbox mode that uses iframe sandboxing instead of the Caja sandbox technology used by the
EMULATED and NATIVE modes. This mode is the default for new scripts as of
November 12, 2015 and for all scripts as of July 6, 2016.
This mode imposes many fewer restrictions than the other sandbox modes and runs fastest, but
does not work at all in certain older browsers, including Internet Explorer 9.
NATIVE
Enum
A sandbox mode that is built on top of ECMAScript 5 strict mode. A sandbox mode built on top of
ECMAScript 5 strict mode. This mode was sunset as
of July 6, 2016. All scripts now use IFRAME mode.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-04 UTC."],[[["\u003cp\u003eSandboxMode is used for setting the sandbox environment for client-side HtmlService scripts in Google Apps Script.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eIFRAME\u003c/code\u003e is the only supported SandboxMode; \u003ccode\u003eNATIVE\u003c/code\u003e and \u003ccode\u003eEMULATED\u003c/code\u003e are deprecated and sunset.\u003c/p\u003e\n"],["\u003cp\u003eClient-side code in HTML service runs in a security sandbox with restrictions to protect users.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eIFRAME\u003c/code\u003e mode has fewer restrictions and runs faster but might not work in older browsers like Internet Explorer 9.\u003c/p\u003e\n"],["\u003cp\u003eYou can read the actual sandbox mode on the client-side using \u003ccode\u003egoogle.script.sandbox.mode\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["SandboxMode\n\nAn enum representing the sandbox modes that can be used for client-side [HtmlService](/apps-script/reference/html/html-service)\nscripts. These values can be accessed from [HtmlService.SandboxMode](/apps-script/reference/html/html-service#SandboxMode), and set by calling\n[HtmlOutput.setSandboxMode(mode)](/apps-script/reference/html/html-output#setSandboxMode(SandboxMode)).\n\nTo call an enum, you call its parent class, name, and property. For example, `\nHtmlService.SandboxMode.IFRAME`.\n\nThe `NATIVE` and `EMULATED` modes were [deprecated on October 13, 2015](https://workspace.google.com/blog/product-announcements/google-apps-script-update-htmlservice) and both are now sunset. Only `IFRAME` mode is now\nsupported.\n\nTo protect users from being served malicious HTML or JavaScript, client-side code served from\nHTML service executes in a security sandbox that imposes restrictions on the code. The method\n[HtmlOutput.setSandboxMode(mode)](/apps-script/reference/html/html-output#setSandboxMode(SandboxMode)) previously allowed script authors to choose\nbetween different versions of the sandbox, but now has no effect. For more information, see the\n[guide to restrictions in HTML service](/apps-script/guides/html/restrictions).\n\nThe `IFRAME` mode imposes many fewer restrictions than the other sandbox modes and runs\nfastest, but does not work at all in certain older browsers, including Internet Explorer 9. The\nsandbox mode can also be read in a client-side script by inspecting `google.script.sandbox.mode`. Note that this property returns the actual mode on the client, which\nmay differ from the mode requested on the server if the requested mode is not supported in the\nuser's browser.\n\n```html\n\u003c!-- Read the sandbox mode (in a client-side script). --\u003e\n\u003cscript\u003e\n alert(google.script.sandbox.mode);\n\u003c/script\u003e\n``` \n\nProperties\n\n| Property | Type | Description |\n|------------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `EMULATED` | `Enum` | A legacy sandbox mode that emulates ECMAScript 5 strict mode using only the features available in ECMAScript 3. This mode was the default prior to February 2014. `EMULATED` was [sunset as of December 10, 2015](/apps-script/guides/support/sunset). All scripts attempting use `EMULATED` will now use `IFRAME` instead. |\n| `IFRAME` | `Enum` | A sandbox mode that uses iframe sandboxing instead of the Caja sandbox technology used by the `EMULATED` and `NATIVE` modes. This mode is the default for new scripts as of November 12, 2015 and for all scripts as of July 6, 2016. This mode imposes many fewer restrictions than the other sandbox modes and runs fastest, but does not work at all in certain older browsers, including Internet Explorer 9. |\n| `NATIVE` | `Enum` | A sandbox mode that is built on top of ECMAScript 5 strict mode. A sandbox mode built on top of ECMAScript 5 strict mode. This mode was [sunset as of July 6, 2016](/apps-script/guides/support/sunset). All scripts now use `IFRAME` mode. |"]]
