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To cite the use of this formal theory, please use
Achim D. Brucker and Michael Herzberg. A Formalization of Web Components. In Archive of
Formal Proofs, 2020. http://www.isa-afp.org/entries/DOM_Components.html,
Formal proof development
A BibTeX entry for LaTeX users is
@InProceedings{ brucker.ea:core-dom:2018,
abstract = {At its core, the Document Object Model (DOM) defines a tree-like
data structure for representing documents in general and HTML
documents in particular. It forms the heart of any rendering engine
of modern web browsers. Formalizing the key concepts of the DOM is
a pre-requisite for the formal reasoning over client-side JavaScript
programs as well as for the analysis of security concepts in modern
web browsers. In this paper, we present a formalization of the core DOM,
with focus on the node-tree and the operations defined on node-trees,
in Isabelle/HOL. We use the formalization to verify the functional
correctness of the most important functions defined in the DOM standard.
Moreover, our formalization is (1) extensible, i.e., can be extended without
the need of re-proving already proven properties and (2) executable, i.e.,
we can generate executable code from our specification.},
address = {New York, NY, USA},
author = {Achim D. Brucker and Michael Herzberg},
booktitle= {The 2018 Web Conference Companion (WWW)},
conf_date= {April 23-27, 2018},
doi = {10.1145/3184558.3185980},
editor = {Pierre{-}Antoine Champin and Fabien L. Gandon and Mounia Lalmas and Panagiotis G. Ipeirotis},
isbn = {978-1-4503-5640-4/18/04},
keywords = {Document Object Model, DOM, Formal Semantics, Isabelle/HOL},
location = {Lyon, France},
pages = {741--749},
pdf = {https://www.brucker.ch/bibliography/download/2018/brucker.ea-core-dom-2018.pdf},
publisher= {ACM Press},
title = {A Formal Semantics of the Core {DOM} in {Isabelle/HOL}},
url = {https://www.brucker.ch/bibliography/abstract/brucker.ea-core-dom-2018},
year = {2018},
}
An overview of the formalization is given in:
Achim D. Brucker and Michael Herzberg. A Formally Verified Model of
Web Components. In Formal Aspects of Component Software (FACS).
Lecture Notes in Computer Science (12018), Springer-Verlag, 2020.
http://www.brucker.ch/bibliography/abstract/brucker.ea-web-components-2019
A BibTeX entry for LaTeX users is
@InCollection{ brucker.ea:web-components:2019,
abstract = {The trend towards ever more complex client-side web applications is unstoppable. Compared to
traditional software development, client-side web development lacks a well-established component
model, i.e., a method for easily and safely reusing already developed functionality. To address this
issue, the web community started to adopt shadow trees as part of the Document Object Model (DOM):
shadow trees allow developers to "partition" a DOM instance into parts that should be safely
separated, e.g., code modifying one part should not, unintentionally, affect other parts of the DOM.
While shadow trees provide the technical basis for defining web components, the DOM standard neither
defines the concept of web components nor specifies the safety properties that web components should
guarantee. Consequently, the standard also does not discuss how or even if the methods for modifying
the DOM respect component boundaries. In this paper, we present a formally verified model of web
components and define safety properties which ensure that different web components can only interact
with each other using well-defined interfaces. Moreover, our verification of the application
programming interface (API) of the DOM revealed numerous invariants that implementations of the DOM
API need to preserve to ensure the integrity of components.},
keywords = {Web Component, Shadow Tree, DOM, Isabelle/HOL},
location = {Amsterdam, The Netherlands},
author = {Achim D. Brucker and Michael Herzberg},
booktitle = {Formal Aspects of Component Software (FACS)},
language = {USenglish},
publisher = pub-springer,
address = pub-springer:adr,
series = s-lncs,
number = 12018,
isbn = {3-540-25109-X},
doi = {10.1007/978-3-030-40914-2_3},
editor = {Sung-Shik Jongmans and Farhad Arbab},
pdf = {http://www.brucker.ch/bibliography/download/2019/brucker.ea-web-components-2019.pdf},
title = {A Formally Verified Model of Web Components},
classification= {conference},
areas = {formal methods, software},
year = 2020,
public = {yes},
url = {http://www.brucker.ch/bibliography/abstract/brucker.ea-web-components-2019}
}

38
README.md

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# A Formalization of Web Components (DOM_Components)
This git repository contains a local mirror of the [Archive of Formal Proofs (AFP)](https://www.isa-afp.org)
entry [*A Formalization of Web Components*](https://www.isa-afp.org/entries/DOM_Components.shtml).
The official AFP releases are tagged. Additionally, this repository may contain extensions (i.e., a
development version) that may be submitted at a later point in time.
## How to build
```console
achim@logicalhacking:~$ isabelle build -D DOM_Components
```
## Authors
* [Achim D. Brucker](http://www.brucker.ch/)
* [Michael Herzberg](http://www.dcs.shef.ac.uk/cgi-bin/makeperson?M.Herzberg)
## License
This project is licensed under a 3-clause BSD-style license.
SPDX-License-Identifier: BSD-3-Clause
## Master Repository
The master git repository for this project is hosted by the [Software
Assurance & Security Research Team](https://logicalhacking.com) at
<https://git.logicalhacking.com/afp-mirror/Core_DOM>.
## Publications
* Achim D. Brucker and Michael Herzberg. A Formally Verified Model of
Web Components. In Formal Aspects of Component Software (FACS).
Lecture Notes in Computer Science (12018), Springer-Verlag, 2020,
[doi:10.1007/978-3-030-40914-2_3](https://doi.org/10.1007/978-3-030-40914-2_3).
<http://www.brucker.ch/bibliography/abstract/brucker.ea-web-components-2019>
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