Testimonials on Wix, in one embed box

Wix has two custom-code routes and only one of them can show a visible widget. The one you want is the Embed HTML element, placed on the page like any other element.

1. Open the page in the Wix Editor.
2. Click Add Elements on the left of the editor.
3. Click Embed Code, then Popular Embeds, then Embed HTML. Click it to drop the element onto the page.
4. With the element selected, choose Code (rather than Website address) and paste the script tag into the field.
5. Drag the box to the size the section should occupy, then publish. This step is not optional on Wix — see the next section for why.

The other route, Settings → Custom Code, injects a snippet into every page’s head or body site-wide. It is the right tool for invisible code and the wrong one here: those snippets are not placed anywhere on the page, so a widget added that way has no position to render at.

Wix keeps a separate mobile layout, so check the mobile editor after you publish — the element needs a size and a position there too.

The Embed HTML element itself is not documented as plan-gated, which makes Wix the mildest of the four platforms here on paper. Two documented rules apply to it anyway.

• HTTPS only. Wix states that “only HTTPS codes and URLs are displayed” and that “your code must contain HTTPS and not HTTP”. A Testymo tag is always https://, so this one takes care of itself — but it is worth knowing before you debug something else.
• It is an iframe. In Wix’s words, “the HTML and URL elements in our editor are iFrames”. Everything in the next section follows from that sentence.

The site-wide route is the gated one. For Settings → Custom Code, Wix says plainly: “Make sure that your site is published and has a connected domain.” Connecting a domain requires a paid plan — Wix describes a Premium or Studio plan as what lets you “connect your own domain (either purchased from Wix or from another domain host), remove the Wix ads, and much more”. Wix also warns that snippets are tied to the domain: “if you assign a different domain to your site, your code snippets will be deleted.”

The widget is cut off, or scrolls inside its own little window.

This is the iframe, and it is the one thing Wix genuinely does differently. The box does not grow to fit its contents, so a tall wall of testimonials inside a short box scrolls instead of expanding. Drag the element taller until the whole set fits, and re-check after you approve more testimonials — the widget grows, the box does not. Picking a widget design with a fixed footprint, like a carousel or a single quote, sidesteps the resizing entirely.

The box is empty in the editor.

Publish and look at the live page before concluding anything. Editors routinely render embedded content differently from the published site, and the published page is the only thing your visitors get.

The widget does not match the width of the section above it.

Wix positions the element, not the widget: the widget fills the box you drew. Line the element up with the section’s edges in the editor, and check the mobile layout separately — Wix keeps its own.

Your site fonts and colours are not applying to the widget.

They will not, on any platform. The widget renders into an open shadow root with its own reset, so nothing outside it reaches in and nothing inside it leaks out. Change the look in the Testymo widget editor; the embed picks it up on the next page load with no edit in Wix.