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Mastering Web Components
Mastering Web Components
概要
Hello World
シンプルな CustomElements で HelloWorld を表示する
connectedCallback ではリソースの fetch や rendering を行う
WAHTWGを参照
https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-autonomous-example
https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-conformance
LifeCycle
Adapted Callback
Extends
Initialize 3 ways
ShadowRootを有効 or 無効
ShadowRootのOpen or Close
Template
Slot
Todo List
発展
備考
contractor でthis.innerHTML など、子要素を加えようとするとエラーとなるので注意する事
またattribute の操作もcontractor 以降で行わないとエラーになる
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