How does webui generated image larger than 1024 1024 using SDXL model?

[ynie]

Hey all, based on my understanding, SDXL can only generate 1024 length images. However, I tried it today with 2048 length images, and they are pretty good. How does webui do this? I don't have any extension installed. Thanks!

childrens_book_illustration, a wooden bridge between two grass field. river in the middle, blue sky <lora:Childrens_book_illustration-000001:1>
Negative prompt: out of frame, text, error, cropped, jpeg artifacts,nout of frame, extra fingers, mutated hands, poorly drawn hands, poorly drawn face, blurry, bad anatomy, malformed limbs, missing arms, missing legs, extra arms, extra legs, fused fingers, too many fingers, long neck, username, watermark, signature.
Steps: 25, Sampler: Euler a, CFG scale: 7.5, Seed: 3816694978, Size: 2048x768, Model hash: 31e35c80fc, Model: sd_xl_base_1.0, Denoising strength: 0.85, ControlNet 0: "Module: depth_midas, Model: depth_SDXL.fp16 [d4ccdb66], Weight: 1, Resize Mode: Crop and Resize, Low Vram: False, Processor Res: 512, Guidance Start: 0, Guidance End: 1, Pixel Perfect: False, Control Mode: Balanced", Lora hashes: "Childrens_book_illustration-000001: 8f054d5f7864", Version: v1.6.0