# Use of deprecated HTML features on the web?
**URL:** \
**Category:** Analysis\
**Created:** [July 26, 2018, 5:34pm UTC](https://discuss.httparchive.org/t/use-of-deprecated-html-features-on-the-web/1416 "2018-07-26T17:34:41Z")\
**Posts on this page:** 1\
**Showing post:** 11
**Author:**  [@rviscomi](https://discuss.httparchive.org/u/rviscomi)\
**Post date:** [August 8, 2019, 5:24pm UTC](https://discuss.httparchive.org/t/use-of-deprecated-html-features-on-the-web/1416/11 "2019-08-08T17:24:54Z")
For [the Markup chapter of the Web Almanac](https://github.com/HTTPArchive/almanac.httparchive.org/issues/84) I revisited this topic. Here are the latest results:
```sql
#standardSQL
# 03_01a: % of pages with deprecated elements
CREATE TEMPORARY FUNCTION containsDeprecatedElement(payload STRING)
RETURNS BOOLEAN LANGUAGE js AS '''
try {
var $ = JSON.parse(payload);
var elements = JSON.parse($._element_count)
var deprecatedElements = new Set(["applet","acronym","bgsound","dir","frame","frameset","noframes","isindex","keygen","listing","menuitem","nextid","noembed","plaintext","rb","rtc","strike","xmp","basefont","big","blink","center","font","marquee","multicol","nobr","spacer","tt"]);
return !!Object.keys(elements).find(e => {
return deprecatedElements.has(e);
});
} catch (e) {
return false;
}
''';
SELECT
_TABLE_SUFFIX AS client,
COUNTIF(containsDeprecatedElement(payload)) AS pages,
ROUND(COUNTIF(containsDeprecatedElement(payload)) * 100 / COUNT(0), 2) AS pct_pages
FROM
`httparchive.pages.2019_07_01_*`
GROUP BY
client
```
| client | pages | % of pages with deprecated elements |
| --- | --- | --- |
| mobile | 804387 | 15.18% |
| desktop | 705134 | 16.13% |
Top deprecated elements:
```sql
#standardSQL
# 03_01b: Top deprecated elements
CREATE TEMPORARY FUNCTION getElements(payload STRING)
RETURNS ARRAY LANGUAGE js AS '''
try {
var $ = JSON.parse(payload);
var elements = JSON.parse($._element_count)
return Object.keys(elements);
} catch (e) {
return [];
}
''';
CREATE TEMPORARY FUNCTION isDeprecated(element STRING) AS (
element IN ("applet","acronym","bgsound","dir","frame","frameset","noframes","isindex","keygen","listing","menuitem","nextid","noembed","plaintext","rb","rtc","strike","xmp","basefont","big","blink","center","font","marquee","multicol","nobr","spacer","tt")
);
SELECT
_TABLE_SUFFIX AS client,
element AS deprecated,
COUNT(0) AS freq,
SUM(COUNT(0)) OVER (PARTITION BY _TABLE_SUFFIX) AS total,
ROUND(COUNT(0) * 100 / SUM(COUNT(0)) OVER (PARTITION BY _TABLE_SUFFIX), 2) AS pct
FROM
`httparchive.pages.2019_07_01_*`,
UNNEST(getElements(payload)) AS element
WHERE
isDeprecated(element)
GROUP BY
client,
deprecated
ORDER BY
freq DESC,
client
```
| client | deprecated | freq | total | pct |
| --- | --- | --- | --- | --- |
| mobile | center | 421571 | 1010479 | 41.72 |
| mobile | font | 390929 | 1010479 | 38.69 |
| desktop | center | 363308 | 887408 | 40.94 |
| desktop | font | 350413 | 887408 | 39.49 |
| mobile | marquee | 63378 | 1010479 | 6.27 |
| desktop | marquee | 46620 | 887408 | 5.25 |
| desktop | nobr | 31002 | 887408 | 3.49 |
| mobile | nobr | 29247 | 1010479 | 2.89 |
| mobile | big | 24996 | 1010479 | 2.47 |
| desktop | big | 23030 | 887408 | 2.6 |
| mobile | frame | 18649 | 1010479 | 1.85 |
| mobile | frameset | 18387 | 1010479 | 1.82 |
| desktop | frame | 17147 | 887408 | 1.93 |
| desktop | frameset | 16902 | 887408 | 1.9 |
| mobile | noframes | 14531 | 1010479 | 1.44 |
| mobile | strike | 14346 | 1010479 | 1.42 |
| desktop | strike | 14270 | 887408 | 1.61 |
| desktop | noframes | 11060 | 887408 | 1.25 |
Kind of surprised to see such a big change since [my last analysis](https://discuss.httparchive.org/t/use-of-deprecated-html-features-on-the-web/1416/2). Namely, `center` taking over the top spot from `font` and `marquee` jumping up the list. This could be due to the [corpus changes](https://discuss.httparchive.org/t/changes-to-the-http-archive-corpus/1539) that happened between these times, with our dataset reaching more of the tail of the web. The methodologies are also a bit different, before I was querying over the HTML itself with a regular expression, and now I’m using a custom metric that extracts each tag at runtime.
You can explore the full results in [this sheet](https://docs.google.com/spreadsheets/d/1WnDKLar_0Btlt9UgT53Giy2229bpV4IM2D_v6OM_WzA/edit?usp=sharing).
---
_[View the full topic](https://discuss.httparchive.org/t/use-of-deprecated-html-features-on-the-web/1416)._