Coupling structures for electronic device housings

An electronic device, comprising:

• a display;
• a cover over the display;
• and
• a housing configured to receive the display and the cover, comprising:
• a first component receiving the cover thereon and defining:
• a first exterior surface region of the housing;
• and
• a first interlock feature;
• a second component forming at least part of an interior cavity of the housing and defining:
• a second exterior surface region of the housing;
• and
• a second interlock feature;
• and
• a joint structure positioned in a gap between the first and second components, comprising:
• a molded element mechanically engaged with the first and second interlock features to inhibit expansion of the gap, the molded element defining a third exterior surface region between the first and second exterior surface regions;
• and
• an elastomeric sealing member abutting the molded element and between the first and second components;
• wherein
• the third exterior surface region, a portion of the first exterior surface region adjacent the molded element, and a portion of the second exterior surface region adjacent the molded element together define a continuous surface.