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miga-heygenandMiguel Ángel
7b5fdb1ad2
The generated catalog pages rendered the "Source" accordion title as a
JSX expression, `<Accordion title={`name.html`}>`. Mintlify's search
indexer stringifies expression attribute nodes rather than evaluating
them, so every one of the 399 catalog pages surfaced its Source section
in search results as "[object Object]" (visible on the Scroll Feed page,
among others).
The template literal carried no escaping benefit: every title is a
single-segment `name.html` path, and a double-quoted JSX string handles
it directly. Introduce `mdxStringAttribute`, which emits a plain
`name="value"` attribute and escapes `& " < { }` as HTML character
references (MDX decodes references inside quoted attribute values, and
unlike JSON.stringify it does not rely on backslash escapes, which JSX
strings do not honour). Use it for both the Source accordion title and
the preview iframe title, and regenerate the catalog pages.
Regenerated with `npx tsx scripts/generate-catalog-pages.ts`; the only
change across the 399 pages is the one Accordion title line each.
Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>
121 lines
4.1 KiB
Plaintext
121 lines
4.1 KiB
Plaintext
---
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title: "Blend Difference"
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description: "Auto-inverting text using mix-blend-mode: difference — flips between white and black per-pixel against the background"
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---
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import { InstallCommand } from "/snippets/install-command.jsx";
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## Install
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<InstallCommand command="npx hyperframes add caption-blend-difference" item="caption-blend-difference" />
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That writes one file: `compositions/components/caption-blend-difference.html`.
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<video className="w-full aspect-video rounded-xl object-cover bg-zinc-100 dark:bg-zinc-800" src="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/components/caption-blend-difference.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/components/caption-blend-difference.png" autoPlay muted loop playsInline />
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## Source
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<Accordion title="caption-blend-difference.html">
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```html
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<!--
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Blend Difference — auto-inverting captions via mix-blend-mode.
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Text color inverts per-pixel against whatever is behind it:
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white stays white on dark areas, flips to black on light areas.
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On color video, white inverts to the complement (blue → orange,
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red → cyan, green → magenta).
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Setup:
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1. The composition root (or a shared ancestor of both the video
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and the caption layer) MUST have `isolation: isolate` so the
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blend operates against sibling content, not the page background.
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2. Add class="blend-difference" to any caption container.
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3. Set caption text color to white. The blend mode handles the rest.
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Works on any element — divs, spans, SVG text, even images.
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Customize:
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- --blend-caption-color: base text color (default white)
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- Change blend mode via --blend-mode to 'exclusion' for a softer effect
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Variants:
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- .blend-difference → standard per-pixel inversion
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- .blend-difference-soft → exclusion mode, less harsh contrast
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- .blend-difference-screen → text glows on dark, fades on light
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-->
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<style>
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.blend-difference {
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mix-blend-mode: var(--blend-mode, difference);
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color: var(--blend-caption-color, white);
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pointer-events: none;
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}
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.blend-difference-soft {
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mix-blend-mode: exclusion;
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color: var(--blend-caption-color, white);
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pointer-events: none;
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}
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.blend-difference-screen {
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mix-blend-mode: screen;
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color: var(--blend-caption-color, white);
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pointer-events: none;
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}
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</style>
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<!--
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Composition setup example:
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<div data-composition-id="root" ... style="isolation: isolate;">
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<video id="bg" data-start="0" data-duration="30" data-track-index="0"
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src="video.mp4" muted playsinline></video>
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<div class="clip blend-difference" data-start="0" data-duration="5" data-track-index="1"
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style="position: absolute; inset: 0; z-index: 10;
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display: flex; align-items: center; justify-content: center;">
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<span style="font-size: 120px; font-weight: 800; text-transform: uppercase;">
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YOUR CAPTION
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</span>
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</div>
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</div>
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Timeline integration — animate captions normally, blend mode is passive:
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tl.from(".caption", {
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y: 50, opacity: 0, duration: 0.6, ease: "expo.out"
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}, 0.2);
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Notes:
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- isolation: isolate on the composition root is REQUIRED.
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Without it, blend mode composes against the page background
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(usually white or black) and you get no inversion.
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- Works with any GSAP animation — the blend composites every frame.
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- For caption containers with multiple text elements, apply the
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class to the shared parent, not each text element individually.
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- On pure black backgrounds, white text stays white (difference
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of white and black = white). The effect is most visible when
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the background has varied luminance or color.
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-->
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```
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</Accordion>
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## Usage
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Open `compositions/components/caption-blend-difference.html` and paste its contents into your composition. See the comment header in the file for detailed instructions.
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{/* hf:generated-footer */}
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Tagged `text` `text-effect` `effect` `blend-mode` `contrast` `inversion`.
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## Related topics
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- [Browse the complete Catalog](/catalog)
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- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
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- [Build a richer composition](/go-further)
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