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What HTML linting can—and cannot—tell you
A source-code linter checks patterns and rules selected for a project. Depending on its configuration, it can flag missing attributes, questionable element use, duplicate IDs, or inconsistent markup. It is useful for finding repeatable issues early, especially in an editor or continuous-integration workflow.
Linting is not the same as validating a document against HTML rules, and neither step alone establishes accessibility conformance. W3C WAI describes validation as a way to reduce ambiguity by checking markup against the technology specification, while noting that validation does not necessarily test full conformance (W3C technique G134). A linter only checks the rules it has been configured to understand.
Some structural checks do matter to accessibility. Correct tag pairing and nesting can help avoid parsing errors, and unique IDs support reliable fragment links and label associations. W3C technique H74 describes checks for correctly specified opening and closing tags and related parsing issues; it also makes clear that techniques are examples, not additional requirements (W3C technique H74).
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Which rules belong in a useful baseline?
HTMLHint’s rule catalog offers configurable examples for plain HTML. Teams can select rules rather than treating every available check as universally required (HTMLHint rules).
Document structure and metadata
- Require an HTML5 doctype: HTMLHint provides
doctype-firstanddoctype-html5. - Require the document language:
html-lang-requirechecks for a language declaration on the root<html>element. - Require character encoding and a nonempty title: consider
meta-charset-requireandtitle-require. - Set project policy for other metadata:
meta-viewport-requireandmeta-description-requireare available checks, but viewport and description metadata should not be presented as accessibility requirements merely because a linter can enforce them.
Semantics and accessible names
- Form controls: check that inputs have labels or an otherwise appropriate accessible name. A visible label associated with its control is generally clearer to users than relying on a placeholder alone. HTMLHint documents input-label checks; JSX projects can use the label/control rules in eslint-plugin-jsx-a11y.
- Images: check for an
altattribute. Content images need alternative text that conveys their relevant information; decorative images should generally use an emptyalt="". A linter can detect a missing attribute, but it cannot reliably judge whether the wording is meaningful in context. - Embedded frames: require an accessible name, such as a useful
titlefor an iframe. HTMLHint and eslint-plugin-jsx-a11y document related checks. - Links and interactive elements: in JSX, consider checks for anchors with content and for clickable non-interactive elements that lack keyboard support. Prefer native elements with the right semantics and built-in behavior rather than recreating them with generic elements.
The JSX accessibility plugin includes checks such as alt-text, anchor-has-content, html-has-lang, and iframe-has-title. Its rules are prompts for source patterns, not a substitute for evaluating the rendered interface (eslint-plugin-jsx-a11y).
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Valid structure and identifiers
- Pair and nest tags correctly: HTMLHint’s
tag-pairrule can flag pairing problems. Avoid obsolete elements withtag-no-obsolete. - Require nonempty sources:
src-not-emptycan catch empty source attributes that may indicate broken or unintended content. - Keep IDs unique:
id-uniquehelps prevent collisions that can break fragment navigation and relationships such as a label’sforreference to a control.
These checks cover selected patterns, not every rule of HTML. Add a standards validator when you need to check markup against HTML requirements; do not assume a successful lint run has done that work.
Consistency and team conventions
Rules for lowercase tag names, indentation, or project-required attributes can make a codebase more predictable, but they are team policy rather than universal accessibility requirements. HTMLHint lets teams configure, disable, and extend rules; its options and custom-rule guidance are documented at HTMLHint options and HTMLHint custom rules. Adopt conventions deliberately, so the linter reinforces agreed practice instead of producing noise.
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Choose tooling for the source you write
The main choice is whether the tool understands your source format and project conventions. HTMLHint is an option for plain HTML. React teams writing JSX can add eslint-plugin-jsx-a11y for accessibility-oriented JSX checks. Templates and custom components need particular attention: a rule may not recognize a framework abstraction unless it is configured to understand the component or its attributes.
| Decision point | What to check |
|---|---|
| Source format | Use a checker that parses the HTML, template syntax, or JSX your project actually contains. |
| Rule purpose | Separate document structure and validity checks, accessibility prompts, and formatting or team conventions. |
| Configuration | Confirm you can enable, disable, customize, or extend rules to fit your project. |
| Custom components | Map component roles and attributes where supported so checks can interpret framework abstractions. |
| Editor and CI workflow | Decide where findings should appear and whether selected checks should run before changes are merged. |
| Follow-up testing | Plan separately for standards validation, rendered-page checks, and assistive-technology evaluation. |
These are selection criteria, not a claim that one tool is faster or more accurate than another. The right baseline depends on your source language, application architecture, and the kinds of issues your team wants to catch automatically.
Build the checks into a broader testing workflow
- Identify the source language. Determine whether pages are written as plain HTML, generated from templates, or expressed as JSX, then choose tooling that can parse that source.
- Enable high-value structural and accessibility prompts. Start with document language, labels, image alternative-text presence, meaningful link structure, named embedded frames, valid tag structure, and unique IDs. Review findings in context rather than treating every automated suggestion as proof of a defect.
- Run a standards validator. Use it to catch markup issues outside the linter’s selected rules. Validation reduces ambiguity, but it is not a complete accessibility conformance test.
- Add team conventions gradually. Review the findings for noise, document narrow and justified exceptions, and adjust the configuration as patterns become clearer. HTMLHint’s configuration guidance explains how rules can be customized (HTMLHint options).
- Test the rendered experience. Inspect interactive states in the browser and evaluate them with assistive technology. Static analysis cannot cover every runtime state or establish whether people can use the page effectively. The eslint-plugin-jsx-a11y project recommends rendered-DOM checks and assistive-technology testing as parts of a broader process (eslint-plugin-jsx-a11y).
How to interpret a clean lint report
A clean report means only that the configured rules did not flag the source. It does not show that alternative text is appropriate, that a custom widget works with a keyboard, that dynamic states expose correct names and values, or that the complete page meets WCAG. Use the report as one signal in a workflow that also checks markup validity and the behavior of the rendered page.
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