What should a CSS triangle runbook actually contain?

A documented runbook records the direction, integer width and height, six-digit HEX color, the synchronized CSS and HTML snippets, the class name, and any accessibility or token-swapping decisions made after generation.

How do I record odd dimensions accurately in my documentation?

For odd totals, the generator splits the perpendicular transparent borders using floor and ceiling, such as 20px and 21px for a 41px base, because Chromium can quantize two 20.5px borders down to 20px each. Document the split values explicitly so they are not corrected later.

Should I document the aria-hidden treatment in the runbook?

Yes. The default snippet uses aria-hidden="true", which is only correct when the triangle is decorative. If the shape communicates state or direction, the runbook should instruct the reader to add visible text or an accessible label on the surrounding control and keep the triangle hidden from assistive technology.

How do I keep the documented recipe current when theming changes?

Update the snippet, the literal color value, and the prose that explains the swap whenever the project moves from a literal HEX to a CSS variable, design token, or theme color. Verify that the target syntax supports the swap and that the transparent side borders remain transparent after the change.

Document the Steps to Generate a CSS Triangle

A documented CSS triangle runbook is a written record of the exact inputs, step order, and generated snippet you use every time you build a four-direction border triangle, kept in one place so you can reproduce the shape without re-deriving the technique. Treating the workflow as a recipe rather than a one-off task turns the border-triangle trick into a reusable asset: a teammate can follow it, a future you can return to it, and a project wiki can hold it next to other UI primitives. The recipe covers which direction you chose, the width and height you entered, the six-digit HEX color you committed to, the synchronized CSS and HTML the tool emits, and any accessibility or naming decisions you layered on top. It also names the constraints the generator enforces, because those constraints explain the odd-pixel split, the strict color format, and the integer range that silently keep the geometry honest.

how do i document the steps i use to generate css triangle — Document the Steps to Generate a CSS Triangle

What a documented CSS triangle runbook actually contains

A runbook is not the same thing as a code snippet. A snippet is what you paste into a stylesheet; a runbook is what you would hand to someone who has never opened the tool before. Treating the workflow as a recipe means capturing the inputs you typed, the order in which you typed them, the output you committed, and the small decisions that did not fit in the code itself. For the CSS Triangle Generator, those non-code decisions are usually the class name, the accessibility treatment, and any plan for swapping the literal HEX for a design token later. Writing them down once makes the triangle reproducible across projects, code reviewers, and future maintenance passes, and it stops the next person on the team from reinventing the trick from scratch.

Inputs to record before you generate

The generator enforces a small, deliberate set of inputs, and your runbook should mirror that set so nothing is missing when you revisit it six months later. The table below lists each input, the value the tool accepts, and what to write down in your record.

Input	Accepted value	What to record
Direction	up, down, left, or right	The chosen direction written as a word
Width	Whole pixels, 10 through 300	The integer pixel count
Height	Whole pixels, 10 through 300	The integer pixel count
Color	Hash plus six hexadecimal digits	The lowercase HEX string exactly as copied
Class name	Any CSS identifier you choose	The literal class used in both outputs

Anything outside these rows is not a supported input, so your documentation can safely refuse to discuss alpha colors, CSS variables, gradients, currentColor, named colors, decimals, or values outside the stated range. Recording the supported shape is part of why the runbook stays short enough to actually read.

The four-step recipe to generate and document

This is the core of your record. The four steps below mirror how the tool itself is used, in order, and they double as the canonical entry in your project wiki.

Pick the direction, the integer width and height, and the six-digit HEX color the triangle should be painted in. The width and height each run as whole pixels from 10 to 300; the color must be a hash followed by exactly six hexadecimal digits and is normalized to lowercase.
Inspect the live preview at the approximate size and on the background where the triangle will actually appear. Border geometry is sensitive to pixel quantization, so what you see in the preview is the same number the colored border will paint on the page.
Copy the CSS and HTML separately, then preserve or replace the decorative accessibility treatment as appropriate. Copy CSS and Copy HTML request clipboard permission independently; if the browser refuses, both blocks stay visible for manual selection and the page does not falsely report success.
Rename the class if the default would collide with an existing stylesheet, then store both snippets together so the HTML reference always points at the matching CSS class.

Anatomy of the snippet to paste into your notes

A useful runbook explains why the snippet looks the way it does, not just what to paste. The CSS uses an element whose content width and height are both zero. Two transparent borders form the two sloping sides and one colored border points in the selected direction. For an upward triangle that means transparent left and right borders plus a colored bottom border; for a downward triangle the colored border sits on top; for a left-pointing triangle the colored border sits on the right with the top and bottom borders transparent; and for a right-pointing triangle the colored border sits on the left. The implementation writes each longhand explicitly so the geometry stays visible and auditable during code review.

The HTML snippet is a single div carrying the generated class and aria-hidden="true". That attribute tells assistive technology to ignore the shape, which is the right call for a decorative arrow, separator, or visual flourish. Your documentation should call this decision out so a future maintainer does not strip it without thinking, and so that anyone using the triangle as a meaningful indicator knows to add visible text or an accessible label on the surrounding control instead.

A single numeric example belongs in the record so the odd-pixel rule is concrete. Take a 41-pixel-wide upward triangle. The two transparent side borders must add to 41, so the generator splits them into 20px and 21px rather than 20.5px and 20.5px. Chromium can otherwise quantize two 20.5px borders down to 20px each and silently drop one painted pixel from the requested total. The colored bottom border equals the full 41px height. Writing "20 plus 21, not 20.5 plus 20.5" in the runbook keeps that rule from being "fixed" later by an unsuspecting editor, and it makes the floor and ceiling logic obvious to anyone reading the snippet.

Limits and accessibility notes worth keeping in the record

The generator is deliberately narrow, and that narrowness is part of why the snippet is trustworthy. Border triangles are solid straight-edged shapes only: no rounded tip, no curved edge, no hollow interior, no gradient fill, no stroke, and no arbitrary polygon. If your design needs any of those, the runbook should say so up front and point at SVG or clip-path as the alternative. See the decision checklist for generating a CSS triangle for the broader question of when the border trick is even the right shape for the component you are building.

The painted color is opaque, so alpha, CSS variables, gradients, currentColor, wide-gamut syntax, and design tokens are not produced by the tool. A runbook entry can legitimately say "swap the color literal for a CSS variable after copying, and verify the target syntax supports it." Accessibility deserves its own paragraph in the record because the default treatment is not universal. The default aria-hidden="true" is correct only when the triangle is decorative. If the shape communicates state, direction, validation, navigation, or any other meaning, the documentation must instruct the reader to add visible text or an accessible label on the surrounding interactive element, and to keep the decorative triangle hidden from assistive technology. Performance is rarely a concern for one triangle, but the runbook can still note that hundreds of decorative elements increase DOM and paint work, so prefer one semantic control with a decorative shape over duplicated hidden controls.

When to revise the documented steps

A runbook is not a one-time write-up; it is a living artifact. Three triggers justify a revision. First, a theming change: if the project moves the triangle's color from a literal HEX to a CSS variable or design token, update the snippet and the surrounding prose so the next reader knows which value to trust and so the transparent side borders are explicitly called out as the parts that must remain transparent after the swap. Second, a dimension revision: if width or height move outside the 10 to 300 range, or if a new direction is introduced, the runbook should reflect the new rule rather than carry stale numbers forward. Third, a semantic change: if a previously decorative triangle becomes a meaningful indicator, or vice versa, the accessibility paragraph and the snippet's aria treatment must be rechecked, and the final shape verified at 200 percent zoom, in high contrast, in forced colors mode, and at common mobile widths.

Test the final result, not just the documentation. The live preview confirms the border geometry; it does not confirm the complete accessibility or layout behavior of the destination component. Rasterization can still vary with zoom and device pixel ratio, so what looked clean in the tool may look soft at 200 percent or harsh in forced colors. The runbook should remind the reader to verify the surrounding component, not just the triangle itself. For reference on the underlying properties, the MDN CSS backgrounds and borders guide documents border properties and transparent color behavior, while the W3C CSS Backgrounds and Borders Level 3 specification defines the longhand border widths, styles, and colors the generator relies on. The exact dimension limits and directional serialization are deliberately local product rules, so document them as such rather than presenting them as a universal triangle standard.