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[Learn how to avoid non-composited animations](https://developer.chrome.com/docs/lighthouse/performance/non-composited-animations/)", "score": null, "scoreDisplayMode": "notApplicable", "metricSavings": { "CLS": 0 }, "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "failureReason", "valueType": "text" }, "label": "Element" } ], "items": [] }, "guidanceLevel": 2 }, "unsized-images": { "id": "unsized-images", "title": "Image elements have explicit `width` and `height`", "description": "Set an explicit width and height on image elements to reduce layout shifts and improve CLS. 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[Learn more about mitigating clickjacking](https://developer.chrome.com/docs/lighthouse/best-practices/clickjacking-mitigation).", "score": null, "scoreDisplayMode": "notApplicable", "details": { "type": "table", "headings": [ { "key": "description", "valueType": "text", "subItemsHeading": { "key": "description" }, "label": "Description" }, { "key": "severity", "valueType": "text", "subItemsHeading": { "key": "severity" }, "label": "Severity" } ], "items": [] } }, "trusted-types-xss": { "id": "trusted-types-xss", "title": "Mitigate DOM-based XSS with Trusted Types", "description": "The `require-trusted-types-for` directive in the `Content-Security-Policy` (CSP) header instructs user agents to control the data passed to DOM XSS sink functions. 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For proper navigation, each access key must be unique. [Learn more about access keys](https://dequeuniversity.com/rules/axe/4.11/accesskeys).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-allowed-attr": { "id": "aria-allowed-attr", "title": "`[aria-*]` attributes match their roles", "description": "Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. [Learn how to match ARIA attributes to their roles](https://dequeuniversity.com/rules/axe/4.11/aria-allowed-attr).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-allowed-role": { "id": "aria-allowed-role", "title": "Uses ARIA roles only on compatible elements", "description": "Many HTML elements can only be assigned certain ARIA roles. Using ARIA roles where they are not allowed can interfere with the accessibility of the web page. [Learn more about ARIA roles](https://dequeuniversity.com/rules/axe/4.11/aria-allowed-role).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-command-name": { "id": "aria-command-name", "title": "`button`, `link`, and `menuitem` elements have accessible names", "description": "When an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn how to make command elements more accessible](https://dequeuniversity.com/rules/axe/4.11/aria-command-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-conditional-attr": { "id": "aria-conditional-attr", "title": "ARIA attributes are used as specified for the element's role", "description": "Some ARIA attributes are only allowed on an element under certain conditions. [Learn more about conditional ARIA attributes](https://dequeuniversity.com/rules/axe/4.11/aria-conditional-attr).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-deprecated-role": { "id": "aria-deprecated-role", "title": "Deprecated ARIA roles were not used", "description": "Deprecated ARIA roles may not be processed correctly by assistive technology. [Learn more about deprecated ARIA roles](https://dequeuniversity.com/rules/axe/4.11/aria-deprecated-role).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-dialog-name": { "id": "aria-dialog-name", "title": "Elements with `role=\"dialog\"` or `role=\"alertdialog\"` have accessible names.", "description": "ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. [Learn how to make ARIA dialog elements more accessible](https://dequeuniversity.com/rules/axe/4.11/aria-dialog-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-hidden-body": { "id": "aria-hidden-body", "title": "`[aria-hidden=\"true\"]` is not present on the document `
`", "description": "Assistive technologies, like screen readers, work inconsistently when `aria-hidden=\"true\"` is set on the document ``. [Learn how `aria-hidden` affects the document body](https://dequeuniversity.com/rules/axe/4.11/aria-hidden-body).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-hidden-focus": { "id": "aria-hidden-focus", "title": "`[aria-hidden=\"true\"]` elements do not contain focusable descendents", "description": "Focusable descendents within an `[aria-hidden=\"true\"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. [Learn how `aria-hidden` affects focusable elements](https://dequeuniversity.com/rules/axe/4.11/aria-hidden-focus).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-input-field-name": { "id": "aria-input-field-name", "title": "ARIA input fields have accessible names", "description": "When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn more about input field labels](https://dequeuniversity.com/rules/axe/4.11/aria-input-field-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-meter-name": { "id": "aria-meter-name", "title": "ARIA `meter` elements have accessible names", "description": "When a meter element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn how to name `meter` elements](https://dequeuniversity.com/rules/axe/4.11/aria-meter-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-progressbar-name": { "id": "aria-progressbar-name", "title": "ARIA `progressbar` elements have accessible names", "description": "When a `progressbar` element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn how to label `progressbar` elements](https://dequeuniversity.com/rules/axe/4.11/aria-progressbar-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-prohibited-attr": { "id": "aria-prohibited-attr", "title": "Elements use only permitted ARIA attributes", "description": "Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. [Learn more about prohibited ARIA roles](https://dequeuniversity.com/rules/axe/4.11/aria-prohibited-attr).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-required-attr": { "id": "aria-required-attr", "title": "`[role]`s have all required `[aria-*]` attributes", "description": "Some ARIA roles have required attributes that describe the state of the element to screen readers. [Learn more about roles and required attributes](https://dequeuniversity.com/rules/axe/4.11/aria-required-attr).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-required-children": { "id": "aria-required-children", "title": "Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.", "description": "Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. [Learn more about roles and required children elements](https://dequeuniversity.com/rules/axe/4.11/aria-required-children).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-required-parent": { "id": "aria-required-parent", "title": "`[role]`s are contained by their required parent element", "description": "Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. [Learn more about ARIA roles and required parent element](https://dequeuniversity.com/rules/axe/4.11/aria-required-parent).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-roles": { "id": "aria-roles", "title": "`[role]` values are valid", "description": "ARIA roles must have valid values in order to perform their intended accessibility functions. [Learn more about valid ARIA roles](https://dequeuniversity.com/rules/axe/4.11/aria-roles).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-text": { "id": "aria-text", "title": "Elements with the `role=text` attribute do not have focusable descendents.", "description": "Adding `role=text` around a text node split by markup enables VoiceOver to treat it as one phrase, but the element's focusable descendents will not be announced. [Learn more about the `role=text` attribute](https://dequeuniversity.com/rules/axe/4.11/aria-text).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-toggle-field-name": { "id": "aria-toggle-field-name", "title": "ARIA toggle fields have accessible names", "description": "When a toggle field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn more about toggle fields](https://dequeuniversity.com/rules/axe/4.11/aria-toggle-field-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-tooltip-name": { "id": "aria-tooltip-name", "title": "ARIA `tooltip` elements have accessible names", "description": "When a tooltip element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn how to name `tooltip` elements](https://dequeuniversity.com/rules/axe/4.11/aria-tooltip-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-treeitem-name": { "id": "aria-treeitem-name", "title": "ARIA `treeitem` elements have accessible names", "description": "When a `treeitem` element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. [Learn more about labeling `treeitem` elements](https://dequeuniversity.com/rules/axe/4.11/aria-treeitem-name).", "score": null, "scoreDisplayMode": "notApplicable" }, "aria-valid-attr-value": { "id": "aria-valid-attr-value", "title": "`[aria-*]` attributes have valid values", "description": "Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. [Learn more about valid values for ARIA attributes](https://dequeuniversity.com/rules/axe/4.11/aria-valid-attr-value).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "aria-valid-attr": { "id": "aria-valid-attr", "title": "`[aria-*]` attributes are valid and not misspelled", "description": "Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid names. [Learn more about valid ARIA attributes](https://dequeuniversity.com/rules/axe/4.11/aria-valid-attr).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "button-name": { "id": "button-name", "title": "Buttons have an accessible name", "description": "When a button doesn't have an accessible name, screen readers announce it as \"button\", making it unusable for users who rely on screen readers. [Learn how to make buttons more accessible](https://dequeuniversity.com/rules/axe/4.11/button-name).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "bypass": { "id": "bypass", "title": "The page contains a heading, skip link, or landmark region", "description": "Adding ways to bypass repetitive content lets keyboard users navigate the page more efficiently. [Learn more about bypass blocks](https://dequeuniversity.com/rules/axe/4.11/bypass).", "score": null, "scoreDisplayMode": "notApplicable" }, "color-contrast": { "id": "color-contrast", "title": "Background and foreground colors have a sufficient contrast ratio", "description": "Low-contrast text is difficult or impossible for many users to read. [Learn how to provide sufficient color contrast](https://dequeuniversity.com/rules/axe/4.11/color-contrast).", "score": 1, "scoreDisplayMode": "binary", "details": { "type": "table", "headings": [ { "key": "node", "valueType": "node", "subItemsHeading": { "key": "relatedNode", "valueType": "node" }, "label": "Failing Elements" } ], "items": [] } }, "definition-list": { "id": "definition-list", "title": "`