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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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package com.sun.faces.facelets.tag.jsf.core;

import com.sun.faces.facelets.tag.TagHandlerImpl;

import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagException;
import java.io.IOException;
import java.util.Map;

public final class PassThroughAttributesHandler extends TagHandlerImpl 
    implements javax.faces.view.facelets.AttributeHandler {

    private final TagAttribute value;

    public PassThroughAttributesHandler(TagConfig config) {
        super(config);
        this.value = this.getRequiredAttribute("value");
    }

    public void apply(FaceletContext ctx, UIComponent parent)
            throws IOException {
        if (parent == null) {
            throw new TagException(this.tag, "Parent UIComponent was null");
        }

        // only process if the parent is new to the tree
        if (parent.getParent() == null) {
            Map componentPassThroughAttrs = parent.getPassThroughAttributes(true);
            Map tagPassThroughAttrs = (Map) this.value.getObject(ctx, Map.class);
            for (Map.Entry cur : tagPassThroughAttrs.entrySet()) {
                componentPassThroughAttrs.put(cur.getKey(), cur.getValue());
            }
        }
    }


    // javax.faces.view.facelets.tag.AttributeHandler.getAttributeName()
    // implementation.
    public String getAttributeName(FaceletContext ctxt) {
        return "value";
    }
}