# Frontend - [A Simple Progress Bar](https://a.b.cr/textbook/frontend/a-simple-progress-bar.md): Create a simple bilibili style progress bar with tailwind - [A React Ribbon Component](https://a.b.cr/textbook/frontend/a-react-ribbon-component.md): It realy took me a long time to create such a unremarkable ribbon - [An Easy to Use React DnD Sortable Component](https://a.b.cr/textbook/frontend/a-easy-to-use-react-dnd-sortable-component.md): I hope this is actually easy to use... - [Sticky Header, Sticky Footer and Fluid Content](https://a.b.cr/textbook/frontend/sticky-header-sticky-footer-and-fluid-content.md): This title came from an ancient question on stack overflow, which is asked over 8 years ago... - [How To Set Same Height As Width In CSS](https://a.b.cr/textbook/frontend/how-to-set-same-height-as-width-in-css.md): I am pretty sure this is a frequently asked question from frontend beginners like me... --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://a.b.cr/textbook/frontend.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.