Custom metrics struct

Appears in: pages table
As custom_metrics

Schema

Field name	Type	Description
`a11y`	JSON	Accessibility.
`cms`	JSON	Content Management Systems.
`cookies`	JSON	Cookie usage.
`css_variables`	JSON	Use of CSS variables.
`ecommerce`	JSON	E-commerce features.
`element_count`	JSON	Number of elements on a page.
`javascript`	JSON	JavaScript usage.
`markup`	JSON	HTML markup.
`media`	JSON	Media elements.
`origin_trials`	JSON	Origin Trials.
`performance`	JSON	Web performance.
`privacy`	JSON	Privacy settings and policies.
`responsive_images`	JSON	Responsive image techniques.
`robots_txt`	JSON	robots.txt file.
`security`	JSON	Security features.
`structured_data`	JSON	Structured data.
`third_parties`	JSON	Third-party resources.
`well_known`	JSON	well-known URIs.
`wpt_bodies`	JSON	Metrics derived from WebPageTest bodies object.
`other`	JSON	Other custom metrics.

`a11y`

Accessibility.

`cms`

Content Management Systems.

`cookies`

Cookie usage.

`css_variables`

Use of CSS variables.

`ecommerce`

E-commerce features.

`element_count`

Number of elements on a page.

`javascript`

JavaScript usage.

`markup`

HTML markup.

`media`

Media elements.

`origin_trials`

Origin Trials.

`performance`

Web performance. See the performance custom metric for more information.

`privacy`

Privacy settings and policies. See the privacy custom metric for more information.

`responsive_images`

Responsive image techniques.

`robots_txt`

robots.txt file.

`security`

Security features.

`structured_data`

Structured data.

`third_parties`

Third-party resources.

`well_known`

well-known URIs.

`wpt_bodies`

Metrics derived from WebPageTest bodies object.

`other`

Other custom metrics.

List:

Field name	Description
`ads`	Advertising technology and usage. See the `ads` custom metric for more information.
`almanac`	Metrics defined in the early versions of Web Almanac crawls.
`aurora`	Project Aurora.
`avg_dom_depth`	The average DOM depth of a page.
`Colordepth`	Color depth of a screen.
`crawl_links`	The links found during a crawl.
`css`	CSS usage.
`doctype`	Document type declaration.
`document_height`	Height of the document.
`document_width`	Width of the document.
`Dpi`	Dots per inch (DPI) of a screen.
`event-names`	Event names used in JavaScript.
`fugu-apis`	Usage of Fugu APIs.
`generated-content`	Client-side generated content.
`has_shadow_root`	Presence of shadow DOM roots.
`Images`	Images usage.
`img-loading-attr`	Image loading attributes.
`initiators`	Resource initiators.
`inline_style_bytes`	Size of inline styles.
`lib-detector-version`	Libraries detector version.
`localstorage_size`	Size of local storage.
`meta_viewport`	Meta viewport tag.
`num_iframes`	Number of iframes on a page.
`num_scripts`	Number of script tags.
`num_scripts`	Number of script tags.
`num_scripts_async`	Number of asynchronous scripts.
`num_scripts_sync`	Number of synchronous scripts.
`observers`	Metrics related to the usage of observer APIs.
`privacy-sandbox`	Privacy Sandbox initiative usage.
`pwa`	Progressive Web Apps.
`quirks_mode`	Usage of quirks mode in browsers.
`Resolution`	Resolution of a screen.
`robots_meta`	Robots meta tag.
`sass`	Usage of Sass.
`sessionstorage_size`	Size of session storage.
`usertiming`	User Timing API.
`valid-head`	Validity of the head element.