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Adding attribute dir="rtl" or dir="rtl" provides information of directionality of the language and will help in applying directional CSS to the element.
- Adding attribute lang="**" is useful for the browser, Search engines and Web accessibility tools (Screen reader to adopt accent of that language) to understand the language of the content. Also this will help in solving language specific issues as these can be used as a CSS selector in special cases.
From the performance perspective, all languages fonts should not be downloaded by default. A font file should be downloaded only if it is needed.All fonts to be applied at body tag and all other child element will inherit the fonts from their.
Implementation Details
HTML Side changes
Based on the user opted language for the interface, HTML tag must contain lang and dir attribute. If the user has not opted any language, English will be the default. Eg - <html lang="en-GB" dir="ltr">.
- Based on the content an element loads, the content element should have lang and dir attributes. Eg - If a card contains the Urdu content - <app-card lang="ur" dir="rtl">
CSS Side Changes
- All language and directional CSS will be served from the single CSS file. i.e. style.css. No Separation of CSS files based on directionality or Language. Performance related concerns/challenges can be handled in effective ways.
- Directional Challenges (Avoiding duplicate codes)
- Some properties which break the inherited directionality of element should be avoided as much as possible such as - text-align, float, left and right properties etc. Eg - an element with CSS property text-align: left will not change directionality to right on changing HTML dir="rtl" hence should be avoided.
- Directionality breaking CSS properties should be replaced with the reusable classes. Eg - mr-20 will add margin-right: 20px in ltr but in rtl it will add margin-left: 20px. Directional properties will be nested with the directional attribute so as to isolate them. Eg- [dir="ltr"] .mr-20{margin-right:20px;} and [dir="rtl"] .mr-20{margin-left:20px;}. Reference -
Multi-font Challenges (Avoid downloading font files if language not used on the page)Language special CSS will be written with nesting to language attribute selector rather than assigning it to the body tag. Eg - [lang="ur"] {font-family: "Noto Nastaliq Urdu";}The correct way to assign fonts for multi-lingual. More details on - https://ui-demo.github.io/fonts2.html
Some Useful links -
- https://ui-demo.github.io/
- https://ui-demo.github.io/common/assamese.html
- https://github.com/wooorm/franc
- https://dmitripavlutin.com/what-every-javascript-developer-should-know-about-unicode/
- https://w3c.github.io/i18n-tests/results/native-user-interfaces
- https://www.w3.org/International/questions/qa-html-dir#ie
- https://www.w3.org/TR/html4/struct/dirlang.html
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