下图storefront.component.html的语义：

将字符串header赋给cx-page-layout selector对应的Angular Component：

/**
 * Creates an empty element using {@link elementStart} and {@link elementEnd}
 *
 * @param index Index of the element in the data array
 * @param name Name of the DOM Node
 * @param attrsIndex Index of the element's attributes in the `consts` array.
 * @param localRefsIndex Index of the element's local references in the `consts` array.
 *
 * @codeGenApi
 */
function ɵɵelement(index, name, attrsIndex, localRefsIndex) {
    ɵɵelementStart(index, name, attrsIndex, localRefsIndex);
    ɵɵelementEnd();
}

elementStart负责创建dom元素：

/**
 * Create DOM element. The instruction must later be followed by `elementEnd()` call.
 *
 * @param index Index of the element in the LView array
 * @param name Name of the DOM Node
 * @param attrsIndex Index of the element's attributes in the `consts` array.
 * @param localRefsIndex Index of the element's local references in the `consts` array.
 *
 * Attributes and localRefs are passed as an array of strings where elements with an even index
 * hold an attribute name and elements with an odd index hold an attribute value, ex.:
 * ['id', 'warning5', 'class', 'alert']
 *
 * @codeGenApi
 */
function ɵɵelementStart(index, name, attrsIndex, localRefsIndex) {
    const lView = getLView();
    const tView = getTView();
    const adjustedIndex = HEADER_OFFSET + index;
    ngDevMode &&
        assertEqual(getBindingIndex(), tView.bindingStartIndex, 'elements should be created before any bindings');
    ngDevMode && ngDevMode.rendererCreateElement++;
    ngDevMode && assertIndexInRange(lView, adjustedIndex);
    const renderer = lView[RENDERER];
    const native = lView[adjustedIndex] = elementCreate(name, renderer, getNamespace());
    const tNode = tView.firstCreatePass ?
        elementStartFirstCreatePass(index, tView, lView, native, name, attrsIndex, localRefsIndex) :
        tView.data[adjustedIndex];
    setPreviousOrParentTNode(tNode, true);
    const mergedAttrs = tNode.mergedAttrs;
    if (mergedAttrs !== null) {
        setUpAttributes(renderer, native, mergedAttrs);
    }
    const classes = tNode.classes;
    if (classes !== null) {
        writeDirectClass(renderer, native, classes);
    }
    const styles = tNode.styles;
    if (styles !== null) {
        writeDirectStyle(renderer, native, styles);
    }
    appendChild(tView, lView, native, tNode);
    // any immediate children of a component or template container must be pre-emptively
    // monkey-patched with the component view data so that the element can be inspected
    // later on using any element discovery utility methods (see `element_discovery.ts`)
    if (getElementDepthCount() === 0) {
        attachPatchData(native, lView);
    }
    increaseElementDepthCount();
    if (isDirectiveHost(tNode)) {
        createDirectivesInstances(tView, lView, tNode);
        executeContentQueries(tView, tNode, lView);
    }
    if (localRefsIndex !== null) {
        saveResolvedLocalsInData(lView, tNode);
    }
}

Instantiate all the directives that were previously resolved on the current node

在这里进行的赋值：

最后的结果，调用Component的set方法：

更多Jerry的原创文章，尽在："汪子熙":