Question: Fill in the blank: Add the ________ attribute to your script to tell the browser to execute it after construction of the DOM.
- defer
- preload
- async
- integrity
Explanation
The correct attribute is defer because it tells the browser to download the script without blocking HTML parsing and execute it after the DOM has been constructed. HubSpot’s performance guidance specifically recommends async or defer for script loading, and defer is the option used when execution should wait until parsing is complete. This preserves document order for deferred scripts, which also makes it suitable for dependent scripts that must run after the page structure is available. The other listed attributes serve different purposes and do not provide this execution timing behavior. HubSpot Developers
Why the other options are incorrect
preload is a resource hint for fetching assets earlier, not a script execution control that waits until after DOM construction.
async allows a script to execute as soon as it finishes downloading, so it does not guarantee execution after parsing completes or preserve script order. HubSpot Developers
integrity is used for Subresource Integrity verification, not for controlling when a script executes.
Source for verification
https://developers.hubspot.com/docs/cms/best-practices/testing-staging-performance/speed
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