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validate-html-nesting
Advanced tools
A parent-child nesting validation library for HTML
This is not a full-blown HTML spec validation (intentionally). The parent-child nesting is considered valid if the Browser does not modify it, regardless of whether or not the HTML spec considers it valid or invalid. So, the library is purely for detecting the kind of element nesting which result in altered DOM.
<p>
hello
<hr/>
</p>
The Browser modifies the above-shown structure to the below-shown structure, which is why the library considers the p > hr
nesting invalid.
<p>hello</p>
<hr />
<p></p>
And though <h1> <div> hi </div> </h1>
markup is technically invalid as per HTML spec, it's still considered valid because the browser does not modify it, so h1 > div
nesting is considered valid by the library.
npm i validate-html-nesting
isValidHTMLNesting(parentTag: string, childTag: string) : boolean
import { isValidHTMLNesting } from 'validate-html-nesting';
isValidHTMLNesting('a', 'a'); // false
// because <a> can not be child of <a>
isValidHTMLNesting('p', 'hr'); // false
// because <hr> can not be child of <p>
isValidHTMLNesting('div', 'a'); // true
// because <a> can be child of <div>
This library is mostly useful for UI framework authors who need a way to make sure that the DOM structure rendered by the browser matches the authored markup so that there are no unexpected behaviors
Refer to validation.test.js to see the full test suite
PRs are welcome. Create an issue if you found a bug.
FAQs
Validate parent-child nesting for HTML elements
The npm package validate-html-nesting receives a total of 122,451 weekly downloads. As such, validate-html-nesting popularity was classified as popular.
We found that validate-html-nesting demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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