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Glossary
Library

Library

A Library is a shared collection of components, styles, and assets you can install across multiple sites in a Workspace. Update something in the Library once, and every site that's installed it can pull in the update.

Libraries keep a team's design system consistent without copying and pasting components between projects. As of July 2026, Libraries also carry a site's Google, Custom, and Adobe fonts along with the components that use them, so a font referenced in tag-level styles now travels with the Library instead of getting left behind.

Relevant courses

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AI guardrails for teams

Manage team AI access, understand the reach of AI-assisted changes, and review what changed before your site goes live.

Collaborate with your team

Learn how to set up roles, permissions, and workflows in Webflow so your entire team can work together safely, confidently, and efficiently.

Design & manage CMS content in Webflow

Learn how to create, manage, and style dynamic content and collections on your site using Webflow’s CMS.

Webflow 101

Introducing Webflow 101, the ultimate course to learn the fundamentals of web design and development.
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Webflow for Reviewers

Learn how to review and give feedback with confidence in Webflow.
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Webflow for Marketers

Learn how to build, edit, and publish with confidence in Webflow.

Other glossary terms

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Serialization

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Serialization is the process of converting data into an optimized format for storage, transmission, and sharing.

Jank

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Jank describes subpar functionality in a web interface that hinders or disrupts user activity.

Structured Query Language (SQL)

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Structured Query Language (SQL) is a programming language that enables storing, retrieving, and manipulating information in a relational database.

RSS

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Really Simple Syndication (RSS) is a web format that automatically distributes frequently updated content to subscribers, eliminating the need for subscribers to check the website manually to stay up to date.

Rich text element

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Allows you to create and format headings, paragraphs, blockquotes, images, and video all in one place instead of having to add and format them individually.

Syntax

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Syntax is the name for the rules specifying a programming language's structure and formatting.

Modal window

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A modal window (or modal) is a web element that displays above all content and restricts user interaction until it’s manually dismissed.

Traffic

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Traffic, or web traffic, refers to the number of users who visit a website over a period of time.

Effects

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A section in the Style panel that houses CSS properties for changing how an element appears, such as its opacity, outline, and box shadows.

Widget

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A widget is an interactive element embedded in a user interface that facilitates specific user actions or displays important information at a glance.

Selector

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A selector identifies and selects specific HTML elements to apply CSS styles to.

Top of the funnel

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Top of the funnel (TOFU) refers to the initial marketing funnel stage where potential customers become aware of a brand’s existence.

Translation inheritance

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Translation inheritance is when a secondary locale automatically mirrors the primary locale's content until a specific field is manually translated, at which point that field stops inheriting further changes.

Unbranded form submission notification

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Form submission notifications that have no reference to Webflow (e.g., notifications sent from “[email protected]” instead of “[email protected]”).

Ciphertext

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Ciphertext is unreadable, encrypted data that ciphers use for security during data transit.

Primitive

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A primitive is the simplest JavaScript data type, representing fundamental values that do not encapsulate any object, method, or property.

Margin

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Margins are an essential spacing element of web design, dictating the amount of whitespace between a box and its surroundings.

CMS section

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A section in the Add panel that contains elements associated with the CMS.

Graphical User Interface (GUI)

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A Graphical User Interface (GUI) is a visual medium that enables visual interaction with software applications or electronic devices through elements like icons, buttons, and menus.

Flex-justify

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A flexbox property that lets you customize the alignment behavior of flex children, based on the main axis of the flex container — that is, whatever you defined as the flex-direction. Options include start, center, end, baseline, and stretch.

Image

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A Webflow element that displays graphical files on your website.

Plugin

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A plugin, also called an add-on or extension, is a software component that enhances the host or browser or application by adding new features or capabilities to it.

Webflow branding

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A visible “Made in Webflow” badge displayed in the bottom right corner of Webflow sites. Webflow branding also appears in the site’s HTML. Learn more about Webflow branding.

Optimizely

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A web app that helps you measure how different site designs impact user behavior.

Alt text

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Alt text, short for alternative text, refers to text that describes online images.

Asynchronous

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Asynchronous programming is an approach where programs simultaneously run multiple operations independently without waiting for previous tasks to complete.

Search Engine Optimization (SEO)

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Search Engine Optimization (SEO) is a collection of strategies to enhance a website’s ranking and visibility on search engines.

Publish site

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The act of updating your live site to reflect new design changes.

Cipher

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In cryptography, a cipher is a digital security algorithm that encrypts and decrypts data.

Collection list layout

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Lets you control how Collection items display inside a Collection list. The default layout option has each item covering the full width of the parent element. You can change this to display Collection items in 2, 3, 4, or 6 columns.

Div block

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A generic element that is typically used to group content, or when no other element is specifically or semantically suitable. Div blocks have no effect on the content or layout until styled with CSS.

Workspace plan

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A Webflow plan that applies to your entire Workspace.

Array

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An array is an ordered, random-access collection of data. This data can be either primitive or object, depending on the coding language.

Middleware

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Middleware is software that links different programs and applications, allowing them to interact and communicate effectively.

Webflow Support

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The place to go when you need help using Webflow.

Favicon

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A 16x16 px image that displays in browser tabs, bookmarks, and other browser areas. It's typically a simplified version of the site's logo.

Certified

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A digital certificate is a data file embedded in the site that signals the site’s safety to visitors, internet service providers (ISPs), and servers.

Left To Right (LTR)

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Left To Right (LTR) describes a text layout that starts from the left and proceeds to the right.

URI

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A Uniform Resource Identifier (URI) is a string of characters identifying an online resource.

Google site verification meta tag

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Adding a Google site verification meta tag to your website's HTML code allows Google to verify that you own the site.

Latency

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Network latency is the time data needs to travel from one point to another, impacting the responsiveness and speed of web applications and services.

Strong text

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The <strong> element defines important text with added semantic importance.

Reference field

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A CMS field used in Collections. This powerful field allows you to link to other Collections within your website to populate fields in Collection lists and Collection pages.

Dynamic element

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Dynamic elements are web page components that can change based on user interaction or external factors, like a live news feed, without requiring a page refresh or reload.

Valid

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A valid CSS pseudo-class is a keyword that enables styling HTML elements based on their state or position in the document structure or web page.

Mobile (landscape) breakpoint

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A Webflow canvas setting that lets you create styles for viewports with a minimum width of 480px and a maximum width of 767px. Also known as the mobile landscape media query.

Bounding box

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A bounding box is a rectangular border around a website element (e.g., a heading, paragraph, or image) that appears during the design process.

Navigator

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A navigator, or a navigator window or panel, is a graphical user interface (GUI) that provides an overview of a website's structure and layout.

Embed component

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A Webflow component you can use to embed HTML to display external content, plugins, or applications.

Username

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The ID used to log into your Webflow account.

Syntax error

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Syntax error refers to a mistake in code that violates the programming language’s rules and prevents the code from executing correctly.

Total Site Pages

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The amount of pages your site currently has.

Key

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A key, or web key, is a unique identifier that authorizes access to a webpage or service.

Free plan

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The perfect Webflow subscription for getting started, giving you access to all Designer features, so you can start building a site right away.

Minified code

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Minified code refers to the process of removing unnecessary characters and whitespace from the source code file without affecting its functionality.

Resolution

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Resolution is a metric measuring clarity and detail through the number of pixels displayed on a screen or used to render an image.

Style Manager

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The third tab in the right-side panel where you can rename element classes, preview your class and tag styles, search for classes and tags, and delete any classes that aren’t in use.

Content management system (CMS)

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A content management system (CMS) is a tool for creating and managing a website and its content.

Domain-Specific Language (DSL)

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A Domain-Specific Language (DSL) is computer script that solves software problems in a specific domain.

BigInt

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BigInt, which stands for “big integer,” is a JavaScript data type. JavaScript uses data types to decide how to treat a piece of data.

Flex-align

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A flexbox property that lets you customize the alignment behavior of flex children, based on the cross-axis of the flex container. The cross axis is the opposite of the flex-direction property, so if you set the direction to vertical, the cross axis is horizontal. Options include start, center, end, baseline, and stretch.

Callback function

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A callback function is passed as an argument to another function and executed upon completing the latter’s task.

Website name

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A website name, or domain, is the title of a website that appears in the browser tab and search engine results.

Profile settings

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The area where you can manage your profile, email settings, and security settings.

Editor toolbar

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The toolbar that appears at the bottom of the Editor. From here, you can access the various Editor panels to manage page settings, dynamic content, forms, and your Editor account. You can also see and publish the changes you make through the Editor.

Common targets

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All elements on the page targeted by the same selector.

Literal

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In JavaScript, literals are fixed values written directly into the code.

Flex-basis

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Flex-basis is a CSS property used in flexboxes that sets the initial size of a flex item before it grows or shrinks.

Display property

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Display properties operate like instructions that tell a browser how to display the different parts of a webpage. You can customize an element’s appearance and layout by changing its display property.

A/B testing

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A/B testing compares two different versions of something — like a web page or campaign — to determine which performs better.

Micro conversion

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Micro conversions are small but important user actions on a website that contribute to the overall conversion funnel.

Last published

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The last time your site was published.

Backup

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A backup is a copy of data stored in an alternate location, including hard drives, cloud servers, or network-attached storage (NAS) servers.

Gutters

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Gutters refer to the whitespace between content columns on a webpage.

States dropdown menu

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The dropdown menu to the right of the Selector field that allows you to access and change the styles of an element when it is hovered, pressed, or focused.

Form button

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A form element that lets website visitors submit data to your form handler.

AJAX

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Asynchronous JavaScript and XML (AJAX) is a web development approach that combines technologies to allow web content to update without reloading.

.htaccess

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.htaccess is a powerful configuration file that allows you to configure and control how your website functions.

Form block

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Form blocks allow you to add form elements to a website, including appointment booking, surveys, applications, polls, and contact forms.

Display: inline-block

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The display: inline-block CSS property defines an element’s appearance and behavior. CSS designers use this code to create website layouts.

XML sitemap (sitemap.xml)

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An XML (Extensible Markup Language) sitemap is a text file that lists a website's pages to help search engines crawl and index them.

Deep copy

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In programming, a deep copy is a replica of an object that doesn’t share the same references as the original. That way, if you make changes to the duplicate, the original stays the same.

Link block

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A link block operates much like a div block, an HTML element for grouping and organizing other HTML elements (like text, images, and forms) into block-level containers. But in the case of a link block, what’s inside the block becomes a link.

Object-oriented programming (OOP)

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Object-oriented programming (OOP) is a programming approach that organizes code into self-contained units of data, functions, and behavior.

Width: auto

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The way browsers calculate an element's width automatically where Block level elements fill the available space of its parent and Inline elements shrink to the size of its children/content.

Background

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A website background is a visual element behind webpage content, enhancing aesthetic appeal and user engagement.

Null

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“Null” represents the absence of a value or the presence of invalid objects in computer science and web development.

Flexbox

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Flexbox is a CSS layout mechanism that offers precise alignment and stacking control for the content inside an element.

Return on investment (ROI)

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Return on investment (ROI) is a metric evaluating the profitability or gain of a venture.

GIF

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A GIF (Graphics Interchange Format) is a digital image format that uses multiple frames of an image or soundless video to create a short, looping animation.

Target

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The currently selected element.

Footer code

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Footer code creates a section at the bottom of every web page that displays important information like disclaimers, copyright or contact information, and links to related documents.

Slider

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A slider is an interactive design element for scrolling through images, videos, and other multimedia content.

Basic section

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A section of the Add panel that contains the elements that act as a website's fundamental building blocks (e.g., div block, list, button, etc.).

URL redirect

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URL redirect, or URL forwarding, is a web server function that automatically sends users from one web address to another.

Columns

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Columns let you create sections of content that sit side by side on your website, like the columns in newspapers. You can choose how many columns you want and their widths. You can also control how they display on smaller screens — such as stacking them.

Network Address Translation (NAT)

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NAT (Network Address Translation) is a technique that enables communication between devices with private internet protocol addresses and the public internet.

Page name

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The title of a page in your site. This is visible in the Pages panel.

Ancestor

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Any element that is further up the element hierarchy of the document tree. For example, the Body element is the ancestor of all elements on the Designer canvas.

DNS records

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DNS records store important information about domains and hostnames. They function like maps, directing DNS queries to the desired endpoint.
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