javascript-tutorial / javascript-tutorial/en.javascript.info
some description not accurate in the article of 《onload-ondomcontentloaded》
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Description
## article
article Link [《onload-ondomcontentloaded》](https://javascript.info/onload-ondomcontentloaded)
## may not accurate
> document.readyState becomes interactive right before DOMContentLoaded. These two things actually mean the same.
> interactive – the document is parsed, happens at about the same time as DOMContentLoaded, but before it.
## reason
if a page containers some "defer" script, then it will cost some time to execute the "defer" script after interactive but before DCL.
## Reference
https://calendar.perfplanet.com/2012/deciphering-the-critical-rendering-path/
>If you add a script and tag it with “defer”, then you unblock the construction of the DOM: the document interactive state does not have to wait for execution of JavaScript. However, note that this same script will be executed before DCL is fired. Further, recall that JavaScript may query CSSOM, which means that the DCL event may be held until the CSSOM is ready, at which point the script will be executed. In short: we’ve unblocked the “document interactive” state, but we’re still potentially blocking DCL.
https://html.spec.whatwg.org/multipage/dom.html#current-document-readiness
> The DOMContentLoaded event fires after the transition to "interactive" but before the transition to "complete", at the point where all subresources apart from async script elements have loaded.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Open the linked onload-ondomcontentloaded article and compare the quoted readyState and DOMContentLoaded descriptions with the WHATWG readiness reference and the defer-script explanation. Update the article so it distinguishes the interactive transition from the later DOMContentLoaded event, then verify the revised wording against those references.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100