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Glossary of Terms

We have compiled this list of terms and definitions to help you better understand the terminology used within the web development community.

SEO Glossary

There are 9 entries in this glossary.
Search for glossary terms (regular expression allowed)

Favicon

A Favicon is the small icon that appears in browser tabs, bookmarks, and some search results next to your site name. Missing or broken favicons make a site look unfinished and less trustworthy. Setting one up correctly improves brand recognition across all platforms.
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Synonyms - Site Icon, Tab Icon, Bookmark Icon

First Contentful Paint

First Contentful Paint measures how long it takes from when a page starts loading until users see the first piece of real content on screen, like text or an image. A fast FCP reassures visitors that the page is working and worth waiting for. It is a key early indicator of perceived speed.
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Synonyms - FCP, Initial Render

First Input Delay

First Input Delay was a Core Web Vital that measured the gap between a user's first interaction, like clicking a button, and the browser actually responding. A long delay makes pages feel sluggish even if they look loaded. It has since been replaced by Interaction to Next Paint.
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Synonyms - FID, Input Latency

Focus Traps

A Focus Trap happens when keyboard users get stuck inside a section of a page and cannot tab their way out. While trapping focus inside an open dialog is expected behavior, accidental traps block navigation entirely. Good focus design always gives users a clear way in and out.
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Synonyms - Keyboard Trap, Focus Lock

Focusable Controls

Focusable Controls means every interactive element on a page can be reached and used with just a keyboard. If a button or link is visible but cannot receive keyboard focus, it is effectively invisible to many users. Reliable focusability is essential for accessible, inclusive design.
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Synonyms - Keyboard Access, Tab Focus

Font Display

Font Display controls how text behaves while custom web fonts are still downloading. Poor settings can leave users staring at invisible text or cause jarring font swaps after the page appears loaded. The right configuration keeps text readable throughout the entire loading process.
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Synonyms - Font Loading, Font Swap, FOUT

Font Size

Font Size refers to how large or small your text appears across different devices and screen sizes. Text that is too small frustrates readers and creates accessibility barriers, especially on mobile. A solid font-size strategy ensures your content stays legible and comfortable everywhere.
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Synonyms - Text Size, Readable Text, Typography

Forced Reflow

Forced Reflow (also called layout thrashing) occurs when JavaScript reads a layout property immediately after writing one, forcing the browser to recalculate the entire page layout synchronously. This blocks the main thread and causes visible jank, especially on mobile devices.
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Synonyms - Layout Thrashing, Synchronous Layout, Layout Recalculation

Four-Word Keywords

Four-Word Keywords are longer, more specific search phrases that usually reflect clear user intent. They tend to be less competitive than shorter terms and attract more qualified visitors. Including natural four-word phrases helps your content match what people are actually searching for.
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Synonyms - Long-Tail Phrases, 4-Word Keywords

What Does "Liquid Purple" mean?

noun | / LIK-wid PUR-pul /

  1. (biochemistry) Also known as visual purple or rhodopsin — a light-sensitive receptor protein found in the rods of the retina. It enables vision in dim light by transforming invisible darkness into visible form. Derived from the Greek rhódon (rose) and ópsis (sight), its name reflects its delicate pink hue and vital role in perception.

  2. (modern usage) Liquid Purple — a digital marketing agency specializing in uncovering unseen opportunities and illuminating brands hidden in the digital dark. Much like its biological namesake, Liquid Purple transforms faint signals into clear visibility — revealing what others overlook and bringing businesses into the light.

Origin: From the scientific term rhodopsin, discovered by Franz Christian Boll in 1876; adopted metaphorically by a marketing firm dedicated to visual clarity in the age of algorithms.

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For over 20 years, Liquid Purple has been headquartered in the heart of Southern California, serving clients across Irvine, Newport Beach, Anaheim, and the greater Los Angeles area. While we are proud of our local roots, our digital reach extends far beyond our local area. We support businesses in major hubs like Denver, Dallas, New York, and Miami, as well as international clients. Our ability to operate across time zones means you can often wake up to completed tasks and progress updates—keeping your business moving while you sleep.