# HTML glossary: Freelancer level

63 HTML terms at the Freelancer level, each with a short definition and a link to its full page.

Updated: September 27, 2026

[Study these as flash cards](https://www.ask-codey.com/decks/html/freelancer)

- [<datalist>](https://www.ask-codey.com/glossary/datalist): The element that supplies suggested options to an associated input without limiting entry to those options.
- [<meter>](https://www.ask-codey.com/glossary/meter): The element that displays a measured value within a known range.
- [<output>](https://www.ask-codey.com/glossary/output): The element that represents the result of a calculation or user action.
- [<progress>](https://www.ask-codey.com/glossary/progress): The element that displays completion progress for a task.
- [<slot>](https://www.ask-codey.com/glossary/slot): The element that marks where assigned light-DOM content appears inside a shadow tree.
- [<template>](https://www.ask-codey.com/glossary/template): The element that stores inert HTML fragments for later use.
- [accept attribute](https://www.ask-codey.com/glossary/accept-attribute): A file-input attribute that hints which file types the user should select.
- [allow attribute](https://www.ask-codey.com/glossary/allow-attribute): An iframe attribute that controls which Permissions Policy features its content may use.
- [Auto popover](https://www.ask-codey.com/glossary/auto-popover): A popover mode with light dismissal that normally closes other auto popovers.
- [Autonomous custom element](https://www.ask-codey.com/glossary/autonomous-custom-element): A custom element with its own hyphenated tag name.
- [capture attribute](https://www.ask-codey.com/glossary/capture-attribute): A file-input attribute that hints a preferred camera or microphone source for new media.
- [crossorigin](https://www.ask-codey.com/glossary/crossorigin): An attribute that configures a cross-origin request and whether credentials are included.
- [Custom element](https://www.ask-codey.com/glossary/custom-element): An author-defined HTML element whose behavior is registered through the Custom Elements API.
- [Customized built-in element](https://www.ask-codey.com/glossary/customized-built-in-element): A custom element that extends a built-in HTML element and uses the is attribute.
- [Declarative shadow DOM](https://www.ask-codey.com/glossary/declarative-shadow-dom): HTML syntax that creates a shadow root from a template element during parsing.
- [download attribute](https://www.ask-codey.com/glossary/download-attribute): An anchor or area attribute that requests a download and can suggest a filename.
- [Download link](https://www.ask-codey.com/glossary/download-link): A hyperlink that suggests downloading its destination instead of navigating to it.
- [enterkeyhint](https://www.ask-codey.com/glossary/enterkeyhint): A global attribute that hints which action label or icon to show on a virtual enter key.
- [exportparts](https://www.ask-codey.com/glossary/exportparts): An attribute that exposes selected part names from a nested shadow tree through its host.
- [Focusable area](https://www.ask-codey.com/glossary/focusable-area): A page region or control that can become the target of keyboard focus.
- [form attribute](https://www.ask-codey.com/glossary/form-attribute): An attribute that associates a form control with a form by id, even when it is outside that form.
- [Form data set](https://www.ask-codey.com/glossary/form-data-set): The ordered name-and-value entries constructed from a form for submission.
- [Form owner](https://www.ask-codey.com/glossary/form-owner): The form element associated with a form control or other form-associated element.
- [Form submission](https://www.ask-codey.com/glossary/form-submission): The process of constructing form data and sending or navigating it to the form's destination.
- [Form-associated element](https://www.ask-codey.com/glossary/form-associated-element): An element with form-related behavior that can be connected to a form owner.
- [Hint popover](https://www.ask-codey.com/glossary/hint-popover): A popover mode for transient hints that can coexist with an auto popover.
- [Iframe sandbox](https://www.ask-codey.com/glossary/iframe-sandbox): Restrictions applied to content in an iframe through its sandbox attribute.
- [Implicit submission](https://www.ask-codey.com/glossary/implicit-submission): Form submission triggered by an action such as pressing Enter in a text control.
- [inert](https://www.ask-codey.com/glossary/inert): A global attribute that prevents an element and its descendants from receiving focus or user interaction.
- [inputmode](https://www.ask-codey.com/glossary/inputmode): A global attribute that hints which input interface, such as a numeric keyboard, would be useful.
- [integrity attribute](https://www.ask-codey.com/glossary/integrity-attribute): An attribute containing hashes used to verify a fetched script or stylesheet.
- [itemid](https://www.ask-codey.com/glossary/itemid): An attribute giving a typed microdata item a global identifier.
- [itemprop](https://www.ask-codey.com/glossary/itemprop): An attribute that assigns one or more property names to data in an element.
- [itemref](https://www.ask-codey.com/glossary/itemref): An attribute that adds properties from elements outside a microdata item's descendants.
- [itemscope](https://www.ask-codey.com/glossary/itemscope): A Boolean attribute that creates a new microdata item.
- [itemtype](https://www.ask-codey.com/glossary/itemtype): An attribute containing vocabulary URLs that define a microdata item's type.
- [Light dismiss](https://www.ask-codey.com/glossary/light-dismiss): Closing a temporary interface by interacting outside it or making a platform close request.
- [list attribute](https://www.ask-codey.com/glossary/list-attribute): The input attribute whose value identifies a datalist containing suggestions.
- [Manual popover](https://www.ask-codey.com/glossary/manual-popover): A popover mode that remains open until explicitly hidden.
- [Microdata](https://www.ask-codey.com/glossary/microdata): HTML attributes that add machine-readable items and name-value properties to document content.
- [Microdata item](https://www.ask-codey.com/glossary/microdata-item): A group of microdata properties describing one thing.
- [Modal dialog](https://www.ask-codey.com/glossary/modal-dialog): A dialog that makes the rest of its document inert until the dialog closes.
- [Multipart form data](https://www.ask-codey.com/glossary/multipart-form-data): A form encoding that separates entries into parts and supports file uploads.
- [Named slot](https://www.ask-codey.com/glossary/named-slot): A slot identified by name so matching host children can be assigned to it.
- [nonce attribute](https://www.ask-codey.com/glossary/nonce-attribute): A one-use token that a Content Security Policy can require on allowed inline script or style elements.
- [Non-modal dialog](https://www.ask-codey.com/glossary/non-modal-dialog): A displayed dialog that allows interaction with the rest of the document.
- [part attribute](https://www.ask-codey.com/glossary/part-attribute): An attribute naming parts inside a shadow tree so external CSS can select them.
- [ping attribute](https://www.ask-codey.com/glossary/ping-attribute): An anchor or area attribute listing URLs to notify when the hyperlink is followed.
- [Ping URL](https://www.ask-codey.com/glossary/ping-url): A URL notified when a user follows a hyperlink, when hyperlink auditing is enabled.
- [Popover](https://www.ask-codey.com/glossary/popover): An element displayed in the top layer using built-in showing, hiding, and dismissal behavior.
- [popover attribute](https://www.ask-codey.com/glossary/popover-attribute): A global attribute that turns an element into a popover.
- [Popover target](https://www.ask-codey.com/glossary/popover-target): A popover element connected to a button or input that can show or hide it.
- [referrerpolicy](https://www.ask-codey.com/glossary/referrerpolicy): An attribute that controls which referrer information is sent when fetching or navigating.
- [Sequential focus navigation](https://www.ask-codey.com/glossary/sequential-focus-navigation): Moving focus through eligible page controls in an ordered sequence, commonly with the Tab key.
- [Shadow host](https://www.ask-codey.com/glossary/shadow-host): An element to which a shadow root is attached.
- [Shadow root](https://www.ask-codey.com/glossary/shadow-root): A document fragment that forms the root of a component's encapsulated shadow tree.
- [shadowrootmode](https://www.ask-codey.com/glossary/shadowrootmode): A template attribute that requests an open or closed declarative shadow root.
- [Slot assignment](https://www.ask-codey.com/glossary/slot-assignment): The process that matches a shadow host's children with slots in its shadow tree.
- [srcdoc](https://www.ask-codey.com/glossary/srcdoc): An iframe attribute containing the HTML document that should be embedded directly.
- [Subresource integrity](https://www.ask-codey.com/glossary/subresource-integrity): A security feature that checks a fetched resource against an expected cryptographic hash.
- [Successful control](https://www.ask-codey.com/glossary/successful-control): A form control that contributes its name and value to submitted form data.
- [Template contents](https://www.ask-codey.com/glossary/template-contents): The separate document fragment containing the child markup of a template element.
- [URL-encoded form data](https://www.ask-codey.com/glossary/url-encoded-form-data): A form encoding that represents name-and-value pairs using URL-style escaping.

- Previous level: [Journeyman](https://www.ask-codey.com/glossary/subjects/html/journeyman)
- Next level: [Master](https://www.ask-codey.com/glossary/subjects/html/master)

[Every HTML term, by level](https://www.ask-codey.com/glossary/subjects/html)

Source: https://www.ask-codey.com/glossary/subjects/html/freelancer