Implementation worksheet
Hand off a pattern with its plain alternative
Package a decorative CSS pattern with an integration record, contrast checks, forced-colors behavior, and a reusable plain alternative.
A pattern export records the marks. A useful handoff also explains where those marks belong, how text stays readable, and what happens when decoration disappears. The pattern handoff worksheet combines blank specification fields with a small HTML and CSS example you can adapt.
Write the pattern's contract
Begin with four decisions: the element receiving the pattern, its decorative purpose, the content that must remain understandable without it, and the person responsible for the next integration check. An example contract could say, “The grid decorates the outer margin of an instruction card; the title, explanation, and action remain on a solid inner surface.”
This makes the pattern dispensable. CSS backgrounds are an appropriate mechanism for purely decorative images; information needed to understand or use the page must have its own accessible representation. If the pattern identifies a status or distinguishes options, document that meaning and supply an equivalent label before treating it as decoration.
Sources: W3C WAI: Decorative CSS images
Keep the export settings with the integration
In Pattern Studio, choose the repeat, two colors, and scale, then download the CSS. Put those settings in the worksheet with the destination selector, stylesheet or component revision, and export filename. Keep a screenshot of the finished placement separately from the original pattern preview. Each answers a different review question.
The studio's PNG export is 1024 by 768 image pixels and uses the same numeric scale in image pixels. Its CSS scale uses CSS pixels. If an integration resizes the PNG, the apparent repeat size changes; record the displayed dimensions. The handoff should say whether the page uses generated CSS or a raster export, because their fallback behavior can differ.
Record the actual contrast pairs
Separate pattern colors from reading colors. For ordinary text, the WCAG minimum contrast threshold is 4.5:1; qualifying large text uses 3:1. Large text generally starts at 18 points, or 14 points when bold. Record the foreground and the actual background behind it, the text size and weight, and the measured ratio. Keep a result untested until it has been measured.
For text placed directly over a pattern, check the least contrasting parts beneath the letters rather than averaging the image. A solid, opaque card makes that background easier to identify. A transparent card still mixes with what is behind it and needs the resulting colors checked. The earlier reading-background guide covers that composition decision.
Keep control checks in separate rows. Visual information needed to identify controls, states, or meaningful graphics generally needs 3:1 against adjacent colors, subject to the criterion's exceptions. This does not require every decorative stripe to meet 3:1. Do not use the contrast ratio between two pattern colors as evidence that a button label or focus indicator is sufficient.
Sources: W3C WAI: Understanding Contrast (Minimum), W3C WAI: Background images and text contrast, W3C WAI: Understanding Non-text Contrast
Let the chosen color mode do its job
In forced-colors mode, the browser can replace author colors with a limited palette chosen for the user's needs. CSS gradients are among the non-URL background images removed in this mode; URL-based background images have different behavior. Shadows can also disappear. A page that depends on a gradient or shadow for essential separation needs a suitable alternative.
The worksheet example uses an ordinary border and includes @media (forced-colors: active) rules with Canvas and CanvasText. It also explicitly removes the decorative background. Keep the normal forced-color-adjust behavior; setting it to none stops automatic color adjustment and should not be used merely to preserve a favorite palette.
Sources: MDN: forced-colors, MDN: forced-color-adjust
Ship a simple plain version
The downloadable example has an outer .pattern-frame and an inner .pattern-card. The frame carries the texture; the card carries the text. Setting data-texture="off" on the frame removes its background image while leaving the content in place. This is an integration hook, not a complete user preference control: the snippet does not create a button, save preferences, or detect a general dislike of patterns.
A separate print rule removes the texture for a plain paper or PDF version. Print styles can be selected with @media print; test the actual preview because the surrounding page and print settings still affect the result. Avoid adding a switch unless the finished product needs one and you can implement its label, keyboard behavior, and state properly.
Sources: MDN: Printing
Complete the handoff with evidence
Review the completed page in its normal state, with the plain hook active, in forced colors, and in print preview. Use the actual heading and action labels. Record clipping, missing borders, unclear controls, and meaning that disappears with the decoration. If a mode cannot be tested in your environment, mark it untested and name the follow-up condition.
Browser developer tools can emulate the forced-colors media feature for a targeted check; Chrome documents this in its Rendering panel. Record emulation as emulation, and keep a real operating-system contrast-theme run distinct when available. Attach the environment, steps, and evidence to each row so a later reviewer can tell what was actually checked.
A useful handoff ends with an exact source revision, reviewed placements, unresolved issues, and a retest owner. Change the pattern, text surface, or control styling later, and revisit the relevant rows. The package should make the next decision easier without suggesting that a downloaded palette or code fragment has already proved the finished interface accessible.