# JavaScript (ES6) + HTML, <s>77</s> 74 bytes

<!-- language: lang-js -->

    f=c=>setTimeout(f,250,-~c%4,o.value="Loading... "+"|/-\\"[~~c])

<!-- language: lang-html -->

    <input id=o

---
## Try It

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

    (f=c=>setTimeout(f,250,-~c%4,o.value="Loading... "+"|/-\\"[~~c]))()

<!-- language: lang-html -->

    <input id=o>

<!-- end snippet -->