Search.js Fix unsafe-inline, Netlify Security Headers

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++++
+title = "Mathematical Notations"
+description = "Sample article showcasing the display of Mathematical Notations, made possible by the KaTeX library."
+date = 2021-05-05
+updated = 2022-01-01
+[taxonomies]
+categories = ["Features"]
+tags = ["shortcodes","Mathematics"]
+[extra]
+math = true
+math_auto_render = true
+keywords = "Math, Matematics, Notation, KaTeX, Mathematical Notation"
++++
+
+You can use [KaTeX](https://katex.org) to render mathematical notations.
+
+You can enable the $\KaTeX$ support globally, per-section or per-page basis.
+<!-- more -->
+# CSP Note
+
+KaTeX unfortunately requires `script-src 'unsafe-inline'` in the Content Security Policy. This is a security vulnerability, so this page will not render KaTeX correctly because this demo site uses best security practices. I have taken a picture below to show you what some of these formulas look like should you enable KaTeX.
+
+KaTeX js is designed to work even with dynamic content, but because Zola is a SSG it seems to me the best solution is to avoid using this javascript all-together, process our markdown files similar to how KaTeX autorender does, but do it during zola build. insert some `<span class="KaTeX_Main">` ...etc so that we basically render it during the build process. If complex mathematics were part of my daily life then I might be motivated to write such code for Zola.
+
+You will also see this page rendered correctly if you git clone this repo and use `zola serve` because then there will be no Content Security Policy in place.
+
+{{ img(src="katex.png" alt="KaTeX" w=568 h=1014) }}
+
+## Enable Globally
+
+To enable the $\KaTeX$ support globally, add `math = true` under `[extra]` of the `config.toml`
+at your site root. Now the katex shortcode will be rendered, you can also add `math_auto_render = true`
+and every section and page of your site will load the KaTeX [autorender extension](https://katex.org/docs/autorender.html).
+
+```toml
+[extra]
+math = true
+math_auto_render = false
+```
+
+## Per-section Basis
+
+To enable the $\KaTeX$ support in a particular section, add `math = true` under `[extra]` in the `[SECTION_NAME]/_index.md`.
+Now the katex shortcode will be rendered, you can also add `math_auto_render = true`
+and the section of your site will load the KaTeX [autorender extension](https://katex.org/docs/autorender.html).
+
+```toml
++++
+[extra]
+math = true
++++
+```
+
+## Per-page Basis
+
+To enable the $\KaTeX$ support in a particular page, add `math = true` under `[extra]` in the page's
+frontmatter. Now the katex shortcode will be rendered, you can also add `math_auto_render = true`
+and the page of your site will load the KaTeX [autorender extension](https://katex.org/docs/autorender.html).
+
+```toml
++++
+[extra]
+math = true
+math_auto_render = true
++++
+```
+
+It is a good practice to enable $\KaTeX$ support on a per-page basis, since this will only load the
+required files on that particular page, without affecting the page load speed of other pages.
+If your site is not math-heavy, please do NOT enable this feature globally or per-section basis.
+
+## Usage
+
+Wrap any [valid](https://katex.org/docs/supported.html) $\KaTeX$ syntax with `$...$` for inline
+Mathematics and `$$...$$` for block Mathematics.
+
+### Inline Mathematics
+
+This is the most beautiful equation I've ever seen:
+
+### Usage
+```rs
+{%/* katex(block=false) */%} e^{i\pi}+1=0 {%/* end */%}
+```
+### Output
+```html
+{% katex(block=false) %} e^{i\pi}+1=0 {% end %}
+```
+{% katex(block=false) %} e^{i\pi}+1=0 {% end %}
+
+### Block Mathematics
+
+Some Mathematics in display mode is fair enough:
+
+### Usage
+```rs
+{%/* katex(block=true) */%} \int_0^1 x^2 dx {%/* end */%}
+```
+### Output
+```html
+{% katex(block=true) %} \int_0^1 x^2 dx {% end %}
+```
+{% katex(block=true) %} \int_0^1 x^2 dx {% end %}
+
+### Auto Render Inline Example
+```
+$ e^{i\pi}+1=0 $
+```
+
+$ e^{i\pi}+1=0 $
+
+### Auto Render Block Example
+```
+$$
+f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
+$$
+```
+
+$$
+f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
+$$
diff --git a/content/overview-math/katex.png b/content/overview-math/katex.png
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