Session Replay Troubleshooting
If you experience unexpected behavior with Datadog Session Replay, use this page to help resolve issues. If you continue to have trouble, contact Datadog Support for further assistance. Regularly update to the latest version of the RUM Browser SDK, as each release contains improvements and fixes.
Session Replay Recorder
Some HTML elements are not visible at replay
Session Replay does not support the following HTML elements:
canvas. Session Replay does not support Web Components.
Fonts or images do not render properly
A Session Replay is not a video, but an actual iframe rebuilt based on snapshots of the DOM. The replay thus depends on the various assets of the page: fonts and images.
Assets may not be available at the time of replay for the following reasons:
- The resource no longer exists. For example, it was part of a previous deployment.
- The resource is inaccessible. For example, authentication might be required, or the resource might only be accessible from an internal network.
- The resource is blocked by the browser due to CORS (typically web-fonts).
- The replay rendered on the
session-replay-datadoghq.com sandbox domain and the asset requests are subject to cross-origin security checks by your browser. If the given asset is not authorized for the domain, your browser blocks the request.
session-replay-datadoghq.com through the
Access-Control-Allow-Origin header for any font or image assets your website depends on to ensure these resources are accessible for the replay. For more information, see Cross Origin Resource Sharing.
CSS rules not properly applied/mouse hover not replayed
Unlike fonts and images, the recorder tries to bundle the various CSS rules applied as part of the recording data, leveraging the CSSStyleSheet interface. If this is not possible, it falls back to recording the links to the CSS files.
For proper mouse hover support, the CSS rules must be accessible through the CSSStyleSheet interface.
If the stylesheets are hosted on a different domain than the web page, access to the CSS rules is subject to cross-origin security checks by the browser, and the browser must be instructed to load the stylesheet leveraging CORS using the crossorigin attribute.
For example, if your application is on the
example.com domain and depends on a CSS file on
assets.example.com through a link element, the
crossorigin attribute should be set to
anonymous, unless credentials are required:
<link rel="stylesheet" crossorigin="anonymous"
Additionally, authorize the
example.com domain in the
assets.example.com. This allows the assets file to load the resource by setting the
Additional helpful documentation, links, and articles: