The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Use CaptureKit’s wait_for_selector when a stable element signals that the content you need is present. Use delay for a fixed pause when you lack a dependable selector. The API documents the fixed-wait parameter as delay, not wait_for_timeout; its range is 0–10 seconds and its default is 0. Neither setting alone proves that the entire page has finished loading.
Selector wait vs. fixed delay: what each one tells CaptureKit
| Option | Waits for | Best fit | Important limit |
|---|---|---|---|
wait_for_selector |
A specified element to appear | A page with a stable selector tied to the content you need | Element appearance does not establish that every script, request, animation, or lazy-loaded region is finished. |
delay |
A fixed elapsed time, in seconds | A short settling pause when no reliable selector exists | It does not check whether the content is ready; the pause may be too short on a slow page or unnecessarily long on a fast one. |
CaptureKit documents both controls for its Capture (Screenshot) API. The reference does not specify what happens if a requested selector never appears, so do not rely on an undocumented timeout or failure behavior.
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Choose the readiness signal that matches your screenshot
Use wait_for_selector for specific dynamic content
Choose an element that appears only when the content you intend to capture is available—for example, the results container rather than a generic header that renders immediately. The selector should correspond to the content in the screenshot; an unrelated element can appear while the important content is still missing.
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Use delay when a fixed pause is all you can specify
Set delay to a value from 0 to 10 seconds. A pause can give a page extra time to settle, but it is not a readiness test. Because it measures elapsed time rather than page state, a chosen pause may be excessive for one response and insufficient for another.
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Use wait_until for lifecycle or network conditions
CaptureKit documents these wait_until values: domcontentloaded, load, networkidle0, and networkidle2. They describe page lifecycle or network conditions, not the appearance of a particular element. Choose one when that broader condition matches what the capture needs; it is a separate control from selector presence.
CaptureKit’s example for monitoring page changes combines networkidle2 with a two-second delay. That is an example configuration, not evidence that this combination is best for every site: How to Track Web Page Changes with Automated Screenshots.
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Configure the CaptureKit screenshot request
The endpoint is GET /v1/capture. Its reference documents a required webpage URL and parameters including output format, viewport, full-page capture, selector targeting, resource blocking, cache controls, wait_until, wait_for_selector, and delay. Each Capture call is listed as one credit. Check the live Capture API reference for exact parameter syntax and current request requirements before integrating.
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In the request, use the documented parameter that matches your chosen signal: wait_for_selector for a relevant element, delay for a fixed pause, or wait_until for a lifecycle/network condition. Do not send wait_for_timeout as if it were the documented fixed-wait parameter. CaptureKit’s Introduction covers authentication and integration context.
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Handle request duration separately from page readiness
A readiness setting does not change the request’s server-side ceiling. CaptureKit’s official Timeouts documentation says real-time API calls have a hard 60-second server-side timeout and recommends async mode for requests expected to run longer. Treat this as a request-level limit, separate from wait_for_selector, delay, and wait_until.
Troubleshoot common dynamic-page capture problems
- The screenshot misses content that loads later: wait for a selector specific to that content, or use a suitable lifecycle condition. A fixed delay only helps if its duration is sufficient for that particular response.
- The selector wait does not match what you need: inspect the page and choose a stable selector for the relevant content, not an element that appears earlier. Selector presence does not mean the whole page is settled.
- You used
wait_for_timeout: the Capture reference documents the fixed pause asdelay, with a 0–10 second range and default 0. Check the current reference for accepted syntax. - A fixed delay still produces inconsistent results: elapsed time does not track variable page readiness. Prefer a content-specific selector where available; otherwise choose a delay within the documented range with the understanding that it is only a pause.
- The request runs too long: distinguish page waiting from total request duration. Real-time calls have a 60-second hard server-side timeout; consider CaptureKit’s async mode for work expected to exceed it.
- You are capturing extracted content rather than an image: CaptureKit’s separate Content API documents similar wait controls alongside HTML and Markdown inclusion options. Its purpose is structured webpage data and content extraction, not screenshot output.
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One-call cURL example (replace YOUR_API_KEY with your key):
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Does CaptureKit document a parameter named wait_for_timeout?
No. Its Capture API reference documents the fixed pause as delay.
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Does finding the selector mean every part of the page is ready?
No. It confirms the specified element has appeared; it is not documented as proof that all scripts, requests, animations, or lazy-loaded regions have finished.
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