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# Atom
```xml
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>Example Feed</title>
<link href="http://example.org/"/>
<updated>2003-12-13T18:30:02Z</updated>
<author>
<name>John Doe</name>
</author>
<id>urn:uuid:60a76c80-d399-11d9-b93C-0003939e0af6</id>
<entry>
<title>Atom-Powered Robots Run Amok</title>
<link href="http://example.org/2003/12/13/atom03"/>
<id>urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a</id>
<updated>2003-12-13T18:30:02Z</updated>
<summary>Some text.</summary>
</entry>
</feed>
```
- feed
- id
- title
- updated
- author
- link
- category
- contributor
- name
- url
- email
- generator
- icon
- logo
- rights
- subtitle
- entry
- id
- title
- updated
- author
- name
- url
- email
- content
- link
- summary
- category
- contributor
- name
- url
- email
- published
- rights
- source
https://validator.w3.org/feed/docs/atom.html

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# HTML Email Development Cheatsheet
## Sources:
- https://frontendmasters.com/courses/html-email-v2/background-images/
- https://github.com/rodriguezcommaj/frontendmasters
- https://codepen.io/collection/21b7ddd5c58aafc450c35c46e7cba9b5?grid_type=list
## Table of Contents
- [Basics](#basics)
- - [Basic HTML Email](#basic-html-email)
- - [CSS Resets](#css-resets)
- - [Email friendly HTML](#email-friendly-html)
- - [Email friendly CSS](#email-friendly-css)
- [Links & Buttons](#links-&-buttons)
- [Images](#images)
- - [Responsive Images](#responsive-images)
- - [Background Images](#background-images)
- [Accessibility](#accessibility)
- [Layouts](#layouts)
- [Mobile Emails](#mobile-emails)
- [Interactivity](#interactivity)
## Basics
- Marketing emails should have unsubscribe links
- Use email testing tools like [email on acid](https://www.emailonacid.com/) or [litmus](https://www.litmus.com/extension/)
- Use [Putsmail](https://putsmail.com) to enter html and it will send it out as an email
- Use [Can I Email](https://caniemail.com) or [Campaign Monitor](https://campaignmonitor.com) or [Fresh Inbox](https://freshinbox.com) to see what's supported in which email clients. just like `caniuse.com`.
- You can use tools to help you build emails like `Litmus builder`, `mjml.io`, `Inky` (from foundation.zurb), `Maizzle` to help you.
- Support channels: `email.geeks.chat`, `litmus.com/community`, `thebetter.email`
### Basic HTML Email
The basic HTML for Emails looks pretty much like the basic HTML for a website
```HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Document</title>
<style type="text/css">
</style>
</head>
<body id="body" style="margin: 0 !important; padding: 0 !important;">
</body>
</html>
```
- `lang` make sure to pass the proper lang for screen readers to know in which language tho read the text
- `body style=` we want to reset the margins and paddings to make sure that the email client does not add something weird to our emails
### CSS Resets
- Email clients add CSS to parts of the email on their own. I.e. highlighting times, phones, dates etc (to add to the calendar or call)
- We want to keep the behavior but improve it's styling
```
/* CLIENT-SPECIFIC STYLES */
body, table, td, a { -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; }
table, td { mso-table-lspace: 0pt; mso-table-rspace: 0pt; }
img { -ms-interpolation-mode: bicubic; }
/* RESET STYLES */
img { border: 0; height: auto; line-height: 100%; outline: none; text-decoration: none; }
table { border-collapse: collapse !important; }
body { height: 100% !important; margin: 0 !important; padding: 0 !important; width: 100% !important; }
/* iOS BLUE LINKS */
a[x-apple-data-detectors] {
color: inherit !important;
text-decoration: none !important;
font-size: inherit !important;
font-family: inherit !important;
font-weight: inherit !important;
line-height: inherit !important;
}
/* GMAIL BLUE LINKS */
u + #body a {
color: inherit;
text-decoration: none;
font-size: inherit;
font-family: inherit;
font-weight: inherit;
line-height: inherit;
}
/* SAMSUNG MAIL BLUE LINKS */
#MessageViewBody a {
color: inherit;
text-decoration: none;
font-size: inherit;
font-family: inherit;
font-weight: inherit;
line-height: inherit;
}
```
Taken from [Rodrigues Commajs example](https://github.com/rodriguezcommaj/frontendmasters/blob/master/Code%20Examples/Background-Image.html)
- Text size 100%: to make sure that they don't adjust the font-size settings (i.e. ios automatically bumps up small font-sizes to minimum 14px)
- mso-table: makes sure that there is no spacing around tables
- interpolation-mode: improves quality of imagery
- style resets: make sure the doc. renders as intended
- Link overrides: to make sure that the links that are automatically added by the email client don't get custom styling
### Email friendly HTML
- Use these for most things: `div`, `span`, `h1`-`h6`, `p`, `strong`, `em`, `img` (simple html tags)
- Most structuring is done with `table`s
- All URLs should be absolute URIs that also contain the protocol, not relative. So `https://google.com/image.jpg` instead of `/image.jpg` or `google.com/image.jpg`.
- `<center></center>` is completely deprecated but can be used to centering parts in outlook.
### Email friendly CSS
- Dont use Linked Stylesheets. A lot of email clients will remove those. Use embedded styles or even better inline styles.
- For text: `color`, `font-family`, `font-size`, `font-style`, `font-weight`, `line-height`, `text-align`.
- For block-level: `margin`, `padding`, `width`, `max-width` (might not always work), `border`.
- Make sure to search online to see what CSS properties are supported in what email client.
- Use pixel sizing `px` instead of relative units etc.
- You can use shorthands. i,e, `margin: 40px 0;` or `margin: 0 auto` to center the content
## Links & Buttons
- Don't use images for buttons
- Use descriptive links (not this "click here", use "read the article" for example)
- Embrace link conventions (i.e. blue and underlined text for links)
- Don't just rely on color. Don't underline things that are not links (might frustrate the user into thinking it's a link)
### Bulletproof buttons
- from https://buttons.cm/ (most reliable):
```html
<div><!--[if mso]>
<v:roundrect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word" href="http://" style="height:40px;v-text-anchor:middle;width:200px;" arcsize="10%" strokecolor="#1e3650" fill="t">
<v:fill type="tile" src="https://i.imgur.com/0xPEf.gif" color="#556270" />
<w:anchorlock/>
<center style="color:#ffffff;font-family:sans-serif;font-size:13px;font-weight:bold;">Show me the button!</center>
</v:roundrect>
<![endif]--><a href="http://"
style="background-color:#556270;background-image:url(https://i.imgur.com/0xPEf.gif);border:1px solid #1e3650;border-radius:4px;color:#ffffff;display:inline-block;font-family:sans-serif;font-size:13px;font-weight:bold;line-height:40px;text-align:center;text-decoration:none;width:200px;-webkit-text-size-adjust:none;mso-hide:all;">Show me the button!</a></div>
```
- Padding based:
```html
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" style="padding: 60px;">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td brcolor="#229efd" style="padding: 12px 18px 12px 18px; border-radius: 3px" align="center">
<a href="…" target="_blank" style="font-size: 18px; text-decoration: none; display: inline-block;">Button</a>
</td>
</tr>
</table>
</td>
</tr>
</table>
```
- Border based
```html
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" style="padding: 60px;">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<a href="…" target="_blank" style="font-size: 18px; text-decoration: none; display: inline-block; color: #ffffff; background-color: #229efd; border-top: 12px solid #229efd; border-bottom: 12px solid #229efd; border-right: 18px solid #229efd;border-left: 18px solid #229efd;">Button</a>
</td>
</tr>
</table>
</td>
</tr>
</table>
```
## Images
- Make them responsive by default
- Use alt text describing the image
- Stick to standards: jpg, png, gif
### Responsive Images
- Set a fixed width for outlook `<img … width="600" border="0" … >`
- `display: block; max-width: 100%; min-width: 100px; width: 100%;` to make them adjust across screen sizes
i.e.
```html
<img width="600" border="0" style="display: block; max-width: 100%; min-width: 100px; width: 100%" src="img/image.jpg" alt="puppy licking ice-cream">
```
### Background Images
- Most reliable on table cells (td)
- Use both: HTML attributes and inline CSS
i.e.
```html
<td background="image/bg.jpg" bgcolor="#229efd" style="background: #229efd url('image/bg.jpg')">
```
## Accessibility
- Left align longer text (center align only short text/headings etc.)
- Keep color contrast high
- Create a strong visual hierarchy
- Focus on readability
- Keep layouts simple and usable
- Use real text instead of images
- Keep tables quiet using `role="presentation"`
- Include text alternatives for images
- Include the language of an email `lang="de"`
### Testing
- Close your eyes and use a real screen reader: NVDA, VoiceOver, JAWS, Browser Extensions (NoCoffeee Vision Simulator, silktide, toadly, lighthouse), Litmus accessibility checker.
## Layouts
- Think in modules
- Use `role="presentation"` on any table
- Don't use table headers, body, footer
- Each component lives in their own rows/tables
- Override defaults using HTML attributes
- Most styles should be included in table tags
Boilerplate:
```html
<!-- Outer Fluid Container Table -->
<table border="0" cellpadding="0" cellspacing="0" role="presentation" width="100%">
<tr>
<td>
<!-- Inner Fixed Container Table -->
<table border="0" cellpadding="0" cellspacing="0" role="presentation" width="600">
<!-- Each TR is it's own email "module", i.e. logo, headline, hero image, etc. -->
<tr>
<td>
<!-- logo -->
</td>
</tr>
<tr>
<td>
<!-- headline -->
</td>
</tr>
</table>
</td>
</tr>
</table>
```
- Basic structure is: Fluid table => Fixed table => Fluid table => Fixed table
## Mobile Emails
- For emails it makes sense to design in desktop first because otherwise you'd get the mobile version on the desktop as the queries don't always work.
- You can use media queries
- Still work with tables but make those responsive
i.e.
```css
@media screen and (max-width: 600px) {
.mobile { width: 100% !important }
.block { display: block !important; width: 100% !important; }
}
```
And add them to the tables i.e. to make them stack.
### Hybrid/Spongy Coding
- Fluid by default
- max-width
- MSO ghost tables:
```
<!--[if (gte mso 9)|(IE)]>
<table cellspacing="0" cellpadding="0" border="0" width="600" align="center" role="presentation"><tr><td>
<![endif]>
```
…content here…
<!--[if (gte mso 9)|(IE)]>
</td></tr></table>
<![endif]>
```
- This will wrap the whole content in tables for Outlook
- `gte` = greater than or equal, `gt` = greater than, `lte` = less than equal to, `lt` = less than.
- `9` = Outlook 2000, `10` = 2002, …, `15` = Outlook 2013
## Interactivity
- `:hover` pseudo selector works (only when included in the header)
- gifs
- movableink (using images that are generated when requested via GET requests. i.e. countdown timer etc.)
- “The checkbox hack” to create state (by using input labels to toggle checkboxes that changes display with sibling selectors to create interactivity):
```html
<input type="radio" class="slide-input" name="slides" id="slide1" checked>
<input type="radio" class="slide-input" name="slides" id="slide2">
<input type="radio" class="slide-input" name="slides" id="slide3">
<label for="slide1" class="slide-label">Slide 1</label>
<label for="slide2" class="slide-label">Slide 2</label>
<label for="slide3" class="slide-label">Slide 3</label>
<div class="slide-content" id="content1">Content 1</div>
<div class="slide-content" id="content2">Content 2</div>
<div class="slide-content" id="content3">Content 3</div>
```
```css
.slide-input { display: 'none' }
.slide-label { cursor: 'pointer' }
.slide-input ~ .slide-content { display: 'none' }
#slide1:checked ~ #content1 { display: 'block' }
#slide2:checked ~ #content2 { display: 'block' }
#slide3:checked ~ #content3 { display: 'block' }
```

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# JSON-RPC
## 요청
```json
{
"jsonrpc": "2.0",
"method": "doSomething",
"params": {
...
},
"id": ...
}
```
## 응답
```json
{
"jsonrpc": "2.0",
"result" : {
...
},
"id": xxx
}
```
### 오류 응답
```json
{
"jsonrpc": "2.0",
"error" : {
"code": xx,
"message": "xxx"
},
"id": xxx
}
```
https://www.jsonrpc.org/

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# Linkback
Start typing here...

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# Pingback
만일 CMS에 다음과 같은 글이 작성되었다고 가정해 봅시다.
```html
<article>
<p>
<a href="http://example.com/some-post">여기</a> 완전 좋아요.
</p>
</article>
```
## 엔드포인트 찾기
CMS 소프트웨어에서는 작성된 글에서 외부 링크들을 추출해서 각각의 링크마다 HTTP HEAD/GET으로 조회를 합니다. 그러면 다음과 유사한 응답을 받을 겁니다.
```
GET /some-post HTTP/1.1
Host: example.com
------
HTTP/1.1 200 OK
X-Pingback: http://example.com/pingback
<html><head> ...
<link href="http://example.com/pingback" rel="pingback" /> ...
```
HTTP 헤더 혹은 `link` 태그에서 웹 멘션 주소를 찾을 수 있습니다.
## 서버 엔드포인트로 메시지 전송
CMS에서는 대상 서버의 엔드 포인트로 XML-RPC 형식으로 메시지를 전송합니다. 메시지에는 `sourceURI``targetURI`가 포함되어야 합니다.
```
POST /http://example.com/webmention HTTP/1.1
Host: example.com
Content-Type: text/xml
<?xml version="1.0">
<methodCall>
<methodName>doSomething</methodName>
<params>
<param>
<value><string>소스URI</string></value>
</param>
<param>
<value><string>타겟URI</string></value>
</param>
</params>
</methodCall>
------
HTTP/1.1 200 OK
```
## XML-RPC 오류 코드
- 0
일반적인 오류
- 0x0010
소스 URI가 없음
- 0x0011
소스 URI가 타겟 URI를 포함하고 있지 않음
- 0x0020
타겟 URI가 없음
- 0x0021
타겟 URI에 핑백을 사용할 수 없음
- 0x0030
이미 핑백이 등록 되었음
- 0x0031
접근 거부
- 0x0032
서버와 통신할 수 없음
## 한편, 메시지를 받은 서버에서는
전달 받은 데이터를 작업 큐에 등록하고, 작업 진행 내역을 보여주는 포에지 주소를 포함하는 `201` 또는 `202`를 응답합니다.
```
HTTP/1.1 201 Created
Location: http://aaronpk.example/webmention/DEhB9Jme
```
```
HTTP/1.1 202 Accepted
```
검증에 실패한 경우에는 `400 Bad Request`를 응답합니다.
## 검증
- source와 target이 모두 유효한 Url인지 여부 확인
- source와 target이 동일하면 거부
https://en.wikipedia.org/wiki/Linkback
http://www.hixie.ch/specs/pingback/pingback

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# Refback
https://en.wikipedia.org/wiki/Refback

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# Robots.txt
http://www.robotstxt.org/
http://humanstxt.org/

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# RSS
```xml
<rss version="2.0">
<channel>
<title></title>
<link></link>
<description></description>
<item>
<title></title>
<link></link>
<description></description>
</item>
</channel>
</rss>
```
- channel
- title
- link
- description
- language
- copyright
- managingEditor
- webMaster
- pubDate
- lastBuildDate
- category
- generator
- docs
- cloud
- ttl
- image
- url
- title
- link
- textInput
- title
- description
- name
- link
- skipHours
- skipDays
- item
- title
- link
- description
- author
- catogory
- comments
- enclosure
- guid
- pubDate
- source
https://validator.w3.org/feed/docs/rss2.html

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# SEO
https://developers.google.com/search/docs/advanced/guidelines/get-started?hl=ko
https://searchadvisor.naver.com/guide

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# sitemap.xml
```xml
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://www.example.com/</loc>
<lastmod>2005-01-01</lastmod>
<changefreq>monthly</changefreq>
<priority>0.8</priority>
</url>
</urlset>
```
- urlset
필수.
- url
필수.
- loc
필수.
- lastmod
ISO 8601
- changefreq
- priority
0. 0~ 1.0
https://www.sitemaps.org/ko/protocol.html

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# Syndication
Start typing here...

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# Trackback
## 주소 찾기
```html
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
<rdf:Description
rdf:about="http://www.foo.com/archive.html#foo"
dc:identifier="http://www.foo.com/archive.html#foo"
dc:title="Foo Bar"
trackback:ping="http://www.foo.com/tb.cgi/5" />
</rdf:RDF>
```
## 전송
```
POST /trackback HTTP/1.1
Host: example.com
Content-Type: application/x-www-form-urlencoded; charset-utf-8
title=Foo+Bar&url=http://www.bar.com/&excerpt=My+Excerpt&blog_name=Foo
```
- title
- excerpt
- url
- blog_name
## 응답
```xml
<?xml version="1.0" encoding="utf-8"?>
<response>
<error>0</error>
</response>
```
### 오류 응답
```xml
<?xml version="1.0" encoding="utf-8"?>
<response>
<error>1</error>
<message>The error message</message>
</response>
```

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# Url
Start typing here...

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# 웹 컴포넌트
## 프로젝트 셋업
```bash
mkdir my-project
cd my-project
yarn init
mkdir src
touch index.js
```
```bash
yarn add webpack webpack-cli webpack-dev-server --dev
yarn add @babel/core @babel/preset-env babel-loader --dev
또는
npx webpack-cli init
```

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# Webmention
만일 CMS에 다음과 같은 글이 작성되었다고 가정해 봅시다.
```html
<article>
<p>
<a href="http://example.com/some-post">여기</a> 완전 좋아요.
</p>
</article>
```
## 엔드포인트 찾기
CMS 소프트웨어에서는 작성된 글에서 외부 링크들을 추출해서 각각의 링크마다 HTTP HEAD/GET으로 조회를 합니다. 그러면 다음과 유사한 응답을 받을 겁니다.
```
GET /some-post HTTP/1.1
Host: example.com
------
HTTP/1.1 200 OK
Link: <http://example.com/webmention>; rel="webmention"
<html><head> ...
<link href="http://example.com/webmention" rel="webmention" /> ...
```
HTTP 헤더 혹은 `link` 태그에서 웹 멘션 주소를 찾을 수 있습니다.
## 서버 엔드포인트로 메시지 전송
CMS에서는 대상 서버의 엔드 포인트로 `application/x-www-form-urlencoded` 형식의 POST 메시지를 전송합니다. 메시지에는 `source``target`이 포함되어야 합니다.
```
POST /http://example.com/webmention HTTP/1.1
Host: example.com
Content-Type: application/x-www-form-urlencoded
source=https://client.example.com/new-post&target=http://example.com/some-post
------
HTTP/1.1 202 Accepted
```
메시지를 받은 서버는 `201 Created` 혹은 `202 Accepted`를 응답합니다.
## 한편, 메시지를 받은 서버에서는
전달 받은 데이터를 작업 큐에 등록하고, 작업 진행 내역을 보여주는 포에지 주소를 포함하는 `201` 또는 `202`를 응답합니다.
```
HTTP/1.1 201 Created
Location: http://aaronpk.example/webmention/DEhB9Jme
```
```
HTTP/1.1 202 Accepted
```
검증에 실패한 경우에는 `400 Bad Request`를 응답합니다.
## 검증
- source와 target이 모두 유효한 Url인지 여부 확인
- source와 target이 동일하면 거부
https://en.wikipedia.org/wiki/Linkback
https://www.w3.org/TR/webmention/

139
doc/etc/XML-Rpc.md Normal file
View File

@@ -0,0 +1,139 @@
# XML-RPC
**XML-RPC**는 HTTP POST를 통해서 XML 메시지를 주고 받습니다.
## 요청
```
POST /xml-rpc HTTP/1.0
Host: example.com
Content-Type: text/xml
<?xml version="1.0">
<methodCall>
<methodName>doSomething</methodName>
<params>
<param>
<value><integer>100</integer></value>
</param>
</params>
</methodCall>
```
## 응답
서버 오류 등이 아닌 경우에는 `200OK`를 응답해야 합니다.
```
HTTP/1.1 200 OK
Content-Type: text/xml
<?xml version="1.0">
<methodResponse>
<params>
<param><string>Hello</string></param>
</params>
</methodResponse>
```
### 오류 응답
```
HTTP/1.1 200 OK
Content-Type: text/xml
<?xml version="1.0">
<methodResponse>
<fault>
<value>
<struct>
<member>
<name>faultCode</name>
<value><int>4</int></value>
</member>
<member>
<name>faultString</name>
<value><string>Too many parameters.</string></value>
</member>
</struct>
</value>
</fault>
</methodResponse>
```
## 자료형
자료형이 생략된 경우에는 `string`으로 간주합니다.
- array
```xml
<array>
<data>
<value><int>100</int></value>
<value><int>101</int></value>
<value><int>102</int></value>
</data>
</array>
```
- base64
```xml
<base64>aW9...cyE=</base64>
```
- boolean
```xml
<boolean>1</boolean>
```
- dateTime.iso8601
```xml
<dateTime.iso8601>2021-01-01T00:12:00</dateTime.iso8601>
```
- double
```xml
<double>100.0</double>
```
- integer
```xml
<int>100</int>
<i4>100</i4>
```
- string
```xml
<string>Hello</string>
```
- struct
```xml
<struct>
<member>
<name>foo</name>
<value><int>100</int></value>
</member>
<member>
<name>bar</name>
<value><string>Hello</string></value>
</member>
</struct>
```
- nil
```xml
<nil />
```
http://xmlrpc.com/