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	Add markdownlint (#20512)
Add `markdownlint` linter and fix issues. Config is based on the one from electron's repo with a few rules relaxed.
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		@@ -26,6 +26,7 @@ Gitea uses [Less CSS](https://lesscss.org), [Fomantic-UI](https://fomantic-ui.co
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The HTML pages are rendered by [Go HTML Template](https://pkg.go.dev/html/template).
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The source files can be found in the following directories:
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* **Less styles:** `web_src/less/`
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* **JavaScript files:** `web_src/js/`
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* **Vue components:** `web_src/js/components/`
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@@ -41,36 +42,37 @@ We recommend [Google HTML/CSS Style Guide](https://google.github.io/styleguide/h
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2. HTML ids and classes should use kebab-case.
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3. HTML ids and classes used in JavaScript should be unique for the whole project, and should contain 2-3 feature related keywords. We recommend to use the `js-` prefix for classes that are only used in JavaScript.
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4. jQuery events across different features could use their own namespaces if there are potential conflicts.
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5. CSS styling for classes provided by frameworks should not be overwritten. Always use new class-names with 2-3 feature related keywords to overwrite framework styles.  
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5. CSS styling for classes provided by frameworks should not be overwritten. Always use new class-names with 2-3 feature related keywords to overwrite framework styles.
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6. The backend can pass complex data to the frontend by using `ctx.PageData["myModuleData"] = map[]{}`
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7. Simple pages and SEO-related pages use Go HTML Template render to generate static Fomantic-UI HTML output. Complex pages can use Vue2 (or Vue3 in future).
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### Framework Usage
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Mixing different frameworks together is discouraged, it makes the code difficult to be maintained.
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A JavaScript module should follow one major framework and follow the framework's best practice.
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Recommended implementations:
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* Vue + Vanilla JS
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* Fomantic-UI (jQuery)
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* Vanilla JS
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Discouraged implementations:
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* Vue + Fomantic-UI (jQuery)
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* jQuery + Vanilla JS
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To make UI consistent, Vue components can use Fomantic-UI CSS classes.
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Although mixing different frameworks is discouraged, 
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it should also work if the mixing is necessary and the code is well-designed and maintainable. 
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Although mixing different frameworks is discouraged,
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it should also work if the mixing is necessary and the code is well-designed and maintainable.
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### `async` Functions
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Only mark a function as `async` if and only if there are `await` calls 
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Only mark a function as `async` if and only if there are `await` calls
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or `Promise` returns inside the function.
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It's not recommended to use `async` event listeners, which may lead to problems.
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The reason is that the code after await is executed outside the event dispatch. 
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The reason is that the code after await is executed outside the event dispatch.
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Reference: https://github.com/github/eslint-plugin-github/blob/main/docs/rules/async-preventdefault.md
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If we want to call an `async` function in a non-async context,
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@@ -88,10 +90,9 @@ However, there are still some special cases, so the current guideline is:
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  * `$.data()` can be used to bind some non-string data to elements in rare cases, but it is highly discouraged.
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* For new code:
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  * `node.dataset` should not be used, use `node.getAttribute` instead. 
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  * `node.dataset` should not be used, use `node.getAttribute` instead.
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  * never bind any user data to a DOM node, use a suitable design pattern to describe the relation between node and data.
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### Legacy Code
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A lot of legacy code already existed before this document's written. It's recommended to refactor legacy code to follow the guidelines.
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